As filed with the Securities and Exchange Commission on February 3, 1999     
                                                    
                                                 Registration No. 333-70881     
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- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
 
                                ----------------
                                 
                              AMENDMENT NO. 1     
                                       
                                    to     
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
 
                                ----------------
                           AMERICAN TOWER CORPORATION
             (Exact name of registrant as specified in its charter)
 
         Delaware                     4899                   65-0723837
     (State or other      (Primary Standard Industrial    (I.R.S. Employer
       jurisdiction       Classification Code Number)   Identification No.)
   of incorporation or
      organization)
 
                             116 Huntington Avenue
                          Boston, Massachusetts 02116
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)
 
                                ----------------
 
                                STEVEN B. DODGE
                           American Tower Corporation
                             116 Huntington Avenue
                          Boston, Massachusetts 02116
                                 (617) 375-7500
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
 
                                ----------------
                          
         Copy to:                                Copy to:
  NORMAN A. BIKALES, ESQ.                JOHN T. BOSTELMAN, ESQ.
 Sullivan & Worcester LLP                  Sullivan & Cromwell
  One Post Office Square                     125 Broad Street
Boston, Massachusetts 02109              New York, New York 10004
---------------- Approximate date of commencement of proposed sale to the public: As soon as practicable after the effective date of this Registration Statement. If any of the securities being registered on this form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box. [_] If this form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. [_] If this form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. [_] If this form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. [_] If delivery of the prospectus is expected to be made pursuant to Rule 434, check the following box. [_] - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- AMERICAN TOWER CORPORATION REGISTRATION STATEMENT ON FORM S-1 PART II INFORMATION NOT REQUIRED IN THE PROSPECTUS Item 13. Other Expenses of Issuance and Distribution. Securities and Exchange Commission fee......................... $162,304 New York Stock Exchange annual fee............................. 25,000 New York Stock Exchange listing fee............................ 25,000 NASD Review fee................................................ 30,500 Printing and engraving fees.................................... 150,000 Accountants' fees and expenses................................. 150,000 Legal fees and expenses........................................ 150,000 Miscellaneous.................................................. 57,196 -------- Total.......................................................... $750,000 ========
No portion of the expenses shall be borne by the Selling Stockholders. Item 14. Indemnification of Directors and Officers. Section 145 of the DGCL provides, in effect, that any person made a party to any action by reason of the fact that he is or was a director, officer, employee or agent of ATC may and, in certain cases, must be indemnified by ATC against, in the case of a non-derivative action, judgments, fines, amounts paid in settlement and reasonable expenses (including attorney's fees), if in either type of action he acted in good faith and in a manner he reasonably believed to be in or not opposed to the best interests of ATC and, in a non-derivative action, which involves a criminal proceeding, in which such person had no reasonable cause to believe his conduct was unlawful. This indemnification does not apply, in a derivative action, to matters as to which it is adjudged that the director, officer, employee or agent is liable to ATC, unless upon court order it is determined that, despite such adjudication of liability, but in view of all the circumstances of the case, he is fairly and reasonably entitled to indemnity for expenses. Article XII of ATC's By-Laws provides that ATC shall indemnify each person who is or was an officer or director of ATC to the fullest extent permitted by Section 145 of the DGCL. Article Sixth of ATC's Restated Certificate states than no director of ATC shall be personally liable to ATC or its stockholders for monetary damages for breach of fiduciary duty as a director, except for (i) breach of the director's duty of loyalty to ATC or its stockholders, (ii) acts or omissions not in good faith or which involve intentional misconduct or knowing violation of law, (iii) liability under Section 174 of the DGCL relating to certain unlawful dividends and stock repurchases, or (iv) any transaction from which the director derived an improper personal benefit. In the Underwriting Agreement to be filed as Exhibit 1.1, the Underwriters have agreed to indemnify ATC, its directors, its officers and its controlling persons signing this registration statement against certain liabilities, including civil liabilities under the Securities Act, or contribute to payments which ATC, its directors, those officers or its controlling persons may be required to make in respect thereof. Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense II-1 of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue. Item 15. Recent Sales of Unregistered Securities. Pursuant to that certain American Tower Systems Corporation Stock Purchase Agreement, dated as of January 8, 1998, by and among ATC and the Purchasers thereto, ATC consummated an equity financing involving the issuance of an aggregate of 1,350,050 shares of Class A Common Stock, 4,649,950 shares of Class B Common Stock and 2,000,000 shares of Class C Common Stock, each at $10.00 per share, in exchange for $30.6 million in cash and $49.4 million of notes secured by common stock of American Radio Systems Corporation having a market value of not less than 175% of the principal amount and accrued and unpaid interest on such notes. Pursuant to that certain Agreement and Plan of Merger, dated as of November 21, 1997, as amended, by and among ATC, American Tower Systems, Inc., a Delaware corporation (now known as American Towers, Inc., "ATI"), Gearon & Co., Inc., a Georgia corporation ("Gearon") and J. Michael Gearon, Jr., pursuant to which Gearon was merged with and into ATI, with ATI as the surviving corporation, in January 1998 ATC issued an aggregate of 5,333,333 shares of Class A Common Stock and paid approximately $32.0 million in cash or assumed liabilities for an aggregate agreed upon consideration of approximately $80.0 million. On June 4, 1998, ATC issued in a private placement to institutional investors 300,000 shares of Series A Pay-In-Kind Preferred Stock, $1,000 liquidation preference per share, ("Interim Preferred Stock") pursuant to the Interim Financing Agreement. Pursuant to the certain Agreement and Plan of Merger, dated as of April 14, 1998, by and among ATC, ATI, Intracoastal Broadcasting, Inc. ("Intracoastal") and the stockholders of Intracoastal, pursuant to which Intracoastal was merged with and into ATI, with ATI as the surviving corporation, in June 1998, ATC issued an aggregate of 720,000 shares of Class A Common Stock and issued its non-recourse note in the principal amount of approximately $12.0 million in exchange for a broadcasting tower and notes in an aggregate principal amount equal to the principal amount of the ATC note. Pursuant to the certain agreement and Plan of Merger, dated as of October 16, 1998, by and among ATC, ATI and Wauka Communications, Inc. ("Wauka"), pursuant to which Wauka was merged with and into ATI, with ATI as the surviving corporation, in October 1998, ATC issued an aggregate of 1,430,881 shares of Class A Common Stock as part of the consideration in the merger. All of the shares referred to in the foregoing paragraphs were issued by ATC in reliance on the exemption from registration provided by Section 4(2) of the Securities Act of 1933, as amended (the "Securities Act"). Each holder represented that it was acquiring its shares for investment purposes and not with a view to distribution within the meaning of the Securities Act. The stock certificates issued to all such holders bore restrictive legends. No commission or other remuneration will be paid or given by ATC directly or indirectly in connection with any of the foregoing transactions. Item 16. Exhibits and Financial Statement Schedules. Listed below are the exhibits which are filed as part of this registration statement (according to the number assigned to them in Item 601 of Regulation S-K). Each exhibit marked by a (*) is incorporated by reference to ATC's Registration Statement on Form S-4 (File No. 333-46025) filed on February 10, 1998. Each exhibit marked by a (+) is incorporated by reference to ATC's Registration Statement on Form S-1 (File No. 333-50111) filed on May 8, 1998. Each exhibit marked by a (++) is incorporated by reference to the filing of II-2 Amendment No. 2 to ATC's Registration Statement on Form S-1 (No. 333-52481) filed on June 30, 1998. Each exhibit marked by a (**) is incorporated by reference to the filing of ATC's Current Report on Form 8-K filed on November 30, 1998. Each exhibit marked by a (***) is incorporated by reference to the filing of ATC's Current Report on Form 8-K filed on January 8, 1999. Exhibit numbers in parenthesis refer to the exhibit number in the applicable filing. Each exhibit marked by a (+++) is incorporated by reference to ATC's Registration Statement on Form S-4 (File No. 333-76083) filed on January 15, 1999. Each Exhibit marked by a (++++) is incorporated by reference from the initial filing of this Registration Statement (333-70881) on January 21, 1999.
Exhibit Exhibit File No. Description of Document No. ------- ----------------------- -------------- 1.1 Underwriting Agreement, by and among ATC and the Representatives of the Underwriters dated February Filed herewith , 1999............................................ as Exhibit 1.1 2.1 Agreement and Plan of Merger, dated as of November 21, 1997, by and among American Tower Systems Corporation ("ATS"), American Tower Systems, Inc., a Delaware corporation ("ATSI"), Gearon & Co., Inc., a Georgia corporation ("Gearon") and J. Michael Gearon, Jr. (the "Gearon Stockholder"). (Schedules and Exhibits omitted)................... (*2.1) 2.2 Amendment No. 1 to Agreement and Plan of Merger, dated as of January 22, 1998, among ATS, American Tower Systems (Delaware), Inc., a Delaware corporation (formerly known as American Tower Systems, Inc.), Gearon and the Gearon Stockholder.. (*2.2) 2.3 Agreement and Plan of Merger, dated as of December 12, 1997, by and among ATS and American Tower Corporation, a Delaware corporation. (Schedules and Exhibits omitted).................................. (*2.3) 2.4 Agreement and Plan of Merger, dated as of November 16, 1998, by and among ATC, American Towers, Inc., a wholly owned subsidiary of ATC and a Delaware corporation ("ATI"), and OmniAmerica, Inc., a Delaware corporation (Schedules and Exhibits omitted)........................................... (**2.1) 2.5 Agreement and Plan of Merger, dated as of November 16, 1998, by and among ATC, ATI and TeleCom Towers, L.L.C., a Delaware limited liability company ("TeleCom") (Schedules and Exhibits omitted)....... (**2.2) 2.6 Amended and Restated Agreement and Plan of Merger, dated as of December 18, 1998, by and among ATC, ATI, ATC Merger Corporation, a Delaware corporation ("ATMC"), and TeleCom (Schedules and Exhibits omitted) .......................................... (***2.1) 2.7 Amendment to the Amended and Restated Agreement and Plan of Merger, dated as of December 23, 1998, by and among ATC, ATI, ATMC, and TeleCom.............. (***2.2) 3(i).1 Restated Certificate of Incorporation of ATC, as filed with the Secretary of State of the State of Delaware on June 5, 1998........................... (++3(i).1) 3(i).2 Certificate of Designation relating to Exchange Pay- In-Kind Preferred Stock as filed with the Secretary of State of the State of Delaware on June 4, 1998.. (++3(i).2) 3(i).3 Certificate of Designation relating to Series A Redeemable Pay-In-Kind Preferred Stock, as filed with the Secretary of State of the State of Delaware on June 4, 1998........................... (++3(i).3) 3(ii).1 By-Laws of ATC...................................... (++3(ii).1) 5 Opinion of Sullivan & Worcester LLP................. Filed herewith as Exhibit 5 10.1 Parent Loan Agreement, dated as of June 16, 1998, by and among ATC, Toronto Dominion (Texas), Inc., as Administrative Agent, and the Lenders parties thereto (the "Parent Loan Agreement").............. (++10.1)
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Exhibit No. Description of Document Exhibit File No. ------- ----------------------- ---------------- 10.1A First Amendment to the Parent Loan Agreement, dated as of October 30, 1998, by and among ATC, Toronto Dominion (Texas), Inc., as Administrative Agent, and the Lenders Parties thereo.................... (+++10.1A) 10.2A ATS Facility A Loan Agreement, dated as of June 16, 1998 among American Tower Systems, L.P. ("ATSLP") and ATSI, as borrowers, and Toronto Dominion (Texas), Inc., as Administrative Agent, and the Banks parties thereto (the "Facility A Loan Agreement")....................................... (++10.2A) 10.2B ATS Facility B Loan Agreement, dated as of June 16, 1998, by and among ATSLP and ATSI, as borrowers, and Toronto Dominion (Texas), Inc., and the Banks parties thereto (the "Facility B Loan Agreement")....................................... (++10.2B) 10.3 First Amendment to the ATS Facility A Loan Agreement, dated as of October 30, 1998 among ATSLP and ATI, as borrowers, and Toronto Dominion (Texas), Inc., as Administrative Agent, and the Banks parties thereto............................. (+++10.3) 10.4 First Amendment to the ATS Facility B Loan Agreement, dated as of October 30, 1998 among ATSLP and ATI, as borrowers, and Toronto Dominion (Texas), Inc., as Administrative Agent, and the Banks parties thereto............................. (+++10.4) 10.5 Asset Purchase Agreement, dated as of February 5, 1997, by and between ATSI and Meridian Radio Sites, a California general partnership ("Meridian Radio"). (Schedules and Exhibits omitted)......... (*10.5) 10.6 First Amendment to Asset Purchase Agreement, dated as of February 10, 1997, by and between ATSI and Meridian Radio.................................... (*10.6) 10.7 Second Amendment to Asset Purchase Agreement, dated as of June 24, 1997, by and between ATSI and Meridian Radio.................................... (*10.7) 10.8 Asset Purchase Agreement, dated as of February 5, 1997, by and between ATSI and Meridian Sales and Services Company, a California corporation ("Meridian Sales"). (Schedules and Exhibits omitted).......................................... (*10.8) 10.9 First Amendment to Asset Purchase Agreement, dated as of February 10, 1997, by and between ATSI and Meridian Sales.................................... (*10.9) 10.10 Second Amendment to Asset Purchase Agreement, dated as of June 24, 1997, by and between ATSI and Meridian Sales.................................... (*10.10) 10.11 Asset Purchase Agreement, dated as of February 5, 1997, by and between ATSI and Meridian Communications North, a California general partnership ("Meridian North"). (Schedules and Exhibits omitted)................................. (*10.11) 10.12 First Amendment to Asset Purchase Agreement, dated as of February 10, 1997, by and between ATSI and Meridian North.................................... (*10.12) 10.13 Second Amendment to Asset Purchase Agreement, dated as of June 24, 1997, by and between ATSI and Meridian North.................................... (*10.13) 10.14 Asset Purchase Agreement, dated as of July 8, 1997, by and between ATSI and Diablo Communications, Inc., a California corporation. (Schedules and Exhibits omitted)................................. (*10.20) 10.15 Asset Purchase Agreement, dated as of July 8, 1997, by and between ATSI and Diablo Communications of Southern California, Inc., a California corporation. (Schedules and Exhibits omitted)..... (*10.21) 10.16 Asset Purchase Agreement, dated as of July 8, 1997, by and between ATS and Suburban Cable T.V. Co..... (*10.22)
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Exhibit No. Description of Document Exhibit File No. ------- ----------------------- ---------------- 10.17 Stock Purchase Agreement, date as of September 30, 1997, by and between ATSI, OPM-USA-INC., a Florida corporation ("OPM"), and the Stockholders of OPM. (Schedules and Exhibits omitted).................. (*10.24) 10.18 Asset Purchase Agreement, dated as of October 4, 1997, by and between ATSI and Tucson Communications Company, L.P., a California limited partnership. (Schedules and Exhibits omitted)..... (*10.25) 10.19 American Tower Systems Corporation 1997 Stock Option Plan, dated as of November 5, 1997, as amended and restated on April 28, 1998............ (+10.26) 10.20 American Tower Systems Corporation Stock Purchase Agreement, dated as of January 8, 1998, by and among ATS and the Purchasers...................... (*10.27) 10.21 Employment Agreement, dated as of January 22, 1988, by and between ATSI and J. Michael Gearon, Jr..... (*10.28) 10.22 Letter of Agreement, dated as of April 13, 1998, by and between ATC and Douglas Wiest................. (+++10.22) 10.23 ARS-ATS Separation Agreement, dated as of June 4, 1998 by and among American Radio Systems Corporation, a Delaware Corporation, ATS, and CBS Corporation....................................... (++10.30) 10.24 Registration Rights Agreement, dated as of January 22, 1998, by and among ATC and each of the Parties Incorporated named therein..................................... by reference to Exhibit 10.3 from the Company's Quarterly Report on Form 10-Q (File No. 001-14194) dated August 14, 1998 21 Subsidiaries of ATC................................ (+++21) 23.0 Consent of Sullivan & Worcester LLP................ Contained in the opinion of Sullivan & Worcester LLP filed herewith as part of Exhibit 5 23.1 Independent Auditors' Consent--Deloitte & Touche (++++ 23.1) LLP............................................... 23.2 Consent of Pressman Ciocca Smith LLP............... (++++ 23.2) 23.3 Consent of Rooney, Ida, Nolt & Ahern............... (++++ 23.3) 23.4 Consent of Ernst & Young LLP....................... (++++ 23.4) 23.5 Consent of KPMG LLP ............................... (++++ 23.5) 23.6 Consent of Bill Mitts, Inc......................... Filed herewith as Exhibit 23.6 23.7 Consent of Arthur Andersen LLP..................... (++++ 23.7) 23.8 Consent of Gollob, Morgan, Peddy & Co., P.C........ (++++ 23.8) 23.9 Consent of KPMG LLP................................ (++++ 23.9)
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Exhibit No. Description of Document Exhibit File No. ------- ----------------------- ---------------- 23.10 Consent of Ernst & Young LLP......................... (++++ 23.10) 23.11 Consent of KPMG LLP.................................. (++++ 23.11) 24 Power of Attorney.................................... (++++ previously filed as page II-7 of the Registration Statement) 99.1 Consent of Director Nominee, Jack D. Furst........... (++++ 99.1) 99.2 Consent of Director Nominee, Dean H. Eisner.......... (++++ 99.2)
Item 17. Undertakings. The undersigned registrant hereby undertakes that: (1) For purposes of determining any liability under the Securities Act, the information omitted from the form of prospectus filed as part of this registration statement in reliance upon Rule 430A and contained in a form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to be part of this registration statement as of the time it was declared effective. (2) For the purpose of determining any liability under the Securities Act, each post-effective amendment that contains a form of prospectus shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at the time shall be deemed to be the initial bona fide offering thereof. II-6 SIGNATURES Pursuant to the requirements of the Securities Act, the Company certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-1 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Boston, Commonwealth of Massachusetts, on the 3rd day of February, 1999. AMERICAN TOWER CORPORATION By: /s/ Steven B. Dodge* ------------------------------------- Steven B. Dodge Chairman of the Board, President and Chief Executive Officer
Signature Title Date --------- ----- ---- /s/ Steven B. Dodge* Chairman, President, Chief February 3, 1999 ____________________________________ Executive Officer and Steven B. Dodge Director /s/ Joseph L. Winn* Chief Financial Officer and February 3, 1999 ____________________________________ Treasurer Joseph L. Winn /s/ Justin D. Benincasa Vice President and Corporate February 3, 1999 ____________________________________ Controller Justin D. Benincasa *Individually and as Attorney-in- Fact /s/ Alan L. Box* Executive Vice President and February 3, 1999 ____________________________________ Director Alan L. Box /s/ Arnold L. Chavkin* Director February 3, 1999 ____________________________________ Arnold L. Chavkin /s/ J. Michael Gearon, Jr.* Executive Vice President and February 3, 1999 ____________________________________ Director J. Michael Gearon Jr. /s/ Randall Mays* Director February 3, 1999 ____________________________________ Randall Mays /s/ Fred Lummis* Director February 3, 1999 ____________________________________ Fred Lummis /s/ Thomas H. Stoner* Director February 3, 1999 ____________________________________ Thomas H. Stoner /s/ Maggie Wilderotter* Director February 3, 1999 ____________________________________ Maggie Wilderotter
II-7 SCHEDULE II AMERICAN TOWER CORPORATION AND SUBSIDIARIES VALUATION AND QUALIFYING ACCOUNTS Period from July 17, 1995 (Incorporation) to December 31, 1995 and the Years Ended December 31, 1996 and 1997
Column A Column B Column C Column D Column E ---------- ---------- -------- ---------- ---------- Balance at Charged to Charged Balance at Beginning Cost and to Other End of Description of Period Expenses Accounts Deductions Period ----------- ---------- ---------- -------- ---------- ---------- Allowance for Doubtful Accounts: Period from July 17, 1995 to December 31, 1995................... $ -- $ -- $-- $ -- $ -- Year Ended December 31, 1996................... $ -- $ 47,044 $-- $ -- $ 47,044 Year Ended December 31, 1997................... $47,044 $124,350 $-- $46,310 $125,084
S-I EXHIBIT INDEX Listed below are the exhibits which are filed as part of this registration statement (according to the number assigned to them in Item 601 of Regulation S-K). Each exhibit marked by a (*) is incorporated by reference to ATC's Registration Statement on Form S-4 (File No. 333-46025) filed on February 10, 1998. Each exhibit marked by a (+) is incorporated by reference to ATC's Registration Statement on Form S-1 (File No. 333- 50111) filed on May 8, 1998. Each exhibit marked by a (++) is incorporated by reference to the filing of Amendment No. 2 to ATC's Registration Statement on Form S-1 (No. 333-52481) filed on June 30, 1998. Each exhibit marked by a (**) is incorporated by reference to the filing of ATC's Current Report on Form 8-K filed on November 30, 1998. Exhibit numbers in parenthesis refer to the exhibit number in the applicable filing. Each exhibit marked by a (***) is incorporated by reference to the filing of ATC's Current Report on Form 8-K filed on January 8, 1999. Exhibit numbers in parenthesis refer to exhibit number in the applicable filing. Each exhibit marked by a (***) is incorporated by reference to ATC's Registration Statement on Form S-4 (File No. 333-76083). Each Exhibit marked by a (++++) is incorporated by reference from the initial filing of this Registration Statement (333-70881) on January 21, 1999.
Exhibit Exhibit File No. Description of Document No. ------- ----------------------- -------------- 1.1 Underwriting Agreement, by and among ATC and the Representatives of the Underwriters dated February Filed herewith , 1999............................................. as Exhibit 1.1 2.1 Agreement and Plan of Merger, dated as of November 21, 1997, by and among American Tower Systems Corporation ("ATS"), American Tower Systems, Inc., a Delaware corporation ("ATSI"), Gearon & Co., Inc., a Georgia corporation ("Gearon") and J. Michael Gearon, Jr. (the "Gearon Stockholder"). (Schedules and Exhibits omitted)............................... (*2.1) 2.2 Amendment No. 1 to Agreement and Plan of Merger, dated as of January 22, 1998, among ATS, American Tower Systems (Delaware), Inc., a Delaware corporation (formerly known as American Tower Systems, Inc.), Gearon and the Gearon Stockholder... (*2.2) 2.3 Agreement and Plan of Merger, dated as of December 12, 1997, by and among ATS and American Tower Corporation, a Delaware corporation. (Schedules and Exhibits omitted)................................... (*2.3) 2.4 Agreement and Plan of Merger, dated as of November 16, 1998, by and among ATC, American Towers, Inc., a wholly owned subsidiary of ATC and a Delaware corporation ("ATI"), and OmniAmerica, Inc., a Delaware corporation (Schedules and Exhibits omitted)............................................ (**2.1) 2.5 Agreement and Plan of Merger, dated as of November 16, 1998, by and among ATC, ATI and TeleCom Towers, L.L.C., a Delaware limited liability company ("TeleCom") (Schedules and Exhibits omitted)........ (**2.2) 2.6 Amended and Restated Agreement and Plan of Merger, dated as of December 18, 1998, by and among ATC, ATI, ATC Merger Corporation, a Delaware corporation ("ATMC"), and TeleCom (Schedules and Exhibits omitted)............................................ (***2.1) 2.7 Amendment to the Amended and Restated Agreement and Plan of Merger, dated as of December 23, 1998, by and among ATC, ATI, ATMC, and TeleCom............... (***2.2) 3(i).1 Restated Certificate of Incorporation of ATC, as filed with the Secretary of State of the State of Delaware on June 5, 1998............................ (++3(i).1) 3(i).2 Certificate of Designation relating to Exchange Pay- In-Kind Preferred Stock as filed with the Secretary of State of the State of Delaware on June 4, 1998... (++3(i).2) 3(i).3 Certificate of Designation relating to Series A Redeemable Pay-In-Kind Preferred Stock, as filed with the Secretary of State of the State of Delaware on June 4, 1998..................................... (++3(i).3)
Exhibit Exhibit File No. Description of Document No. ------- ----------------------- -------------- 3(ii).1 By-Laws of ATC...................................... (++3(ii).1) 5 Opinion of Sullivan & Worcester LLP................. Filed herewith as Exhibit 5 10.1 Parent Loan Agreement, dated as of June 16, 1998, by and among ATC, Toronto Dominion (Texas), Inc., as Administrative Agent, and the Lenders parties thereto (the "Parent Loan Agreement").............. (++10.1) 10.1A First Amendment to the Parent Loan Agreement, dated as of October 30, 1998, by and among ATC, Toronto Dominion (Texas), Inc., as Administrative Agent, and the Lenders Parties thereo..................... (+++10.1A) 10.2A ATS Facility A Loan Agreement, dated as of June 16, 1998 among American Tower Systems, L.P. ("ATSLP") and ATSI, as borrowers, and Toronto Dominion (Texas), Inc., as Administrative Agent, and the Banks parties thereto (the "Facility A Loan Agreement")........................................ (++10.2A) 10.2B ATS Facility B Loan Agreement, dated as of June 16, 1998, by and among ATSLP and ATSI, as borrowers, and Toronto Dominion (Texas), Inc., and the Banks parties thereto (the "Facility B Loan Agreement").. (++10.2B) 10.3 First Amendment to the ATS Facility A Loan Agreement, dated as of October 30, 1998 among ATSLP and ATI, as borrowers, and Toronto Dominion (Texas), Inc., as Administrative Agent, and the Banks parties thereto.............................. (+++10.3) First Amendment to the ATS Facility B Loan Agreement, dated as of October 30, 1998 among ATSLP and ATI, as borrowers, and Toronto Dominion (Texas), Inc., as Administrative Agent, and the 10.4 Banks parties thereto.............................. (+++10.4) 10.5 Asset Purchase Agreement, dated as of February 5, 1997, by and between ATSI and Meridian Radio Sites, a California general partnership ("Meridian Radio"). (Schedules and Exhibits omitted).......... (*10.5) 10.6 First Amendment to Asset Purchase Agreement, dated as of February 10, 1997, by and between ATSI and Meridian Radio..................................... (*10.6) 10.7 Second Amendment to Asset Purchase Agreement, dated as of June 24, 1997, by and between ATSI and Meridian Radio..................................... (*10.7) 10.8 Asset Purchase Agreement, dated as of February 5, 1997, by and between ATSI and Meridian Sales and Services Company, a California corporation ("Meridian Sales"). (Schedules and Exhibits omitted)........................................... (*10.8) 10.9 First Amendment to Asset Purchase Agreement, dated as of February 10, 1997, by and between ATSI and Meridian Sales..................................... (*10.9) 10.10 Second Amendment to Asset Purchase Agreement, dated as of June 24, 1997, by and between ATSI and Meridian Sales..................................... (*10.10) 10.11 Asset Purchase Agreement, dated as of February 5, 1997, by and between ATSI and Meridian Communications North, a California general partnership ("Meridian North"). (Schedules and Exhibits omitted).................................. (*10.11) 10.12 First Amendment to Asset Purchase Agreement, dated as of February 10, 1997, by and between ATSI and Meridian North..................................... (*10.12) 10.13 Second Amendment to Asset Purchase Agreement, dated as of June 24, 1997, by and between ATSI and Meridian North..................................... (*10.13)
Exhibit Exhibit File No. Description of Document No. ------- ----------------------- -------------- 10.14 Asset Purchase Agreement, dated as of July 8, 1997, by and between ATSI and Diablo Communications, Inc., a California corporation. (Schedules and Exhibits omitted)............................................ (*10.20) 10.15 Asset Purchase Agreement, dated as of July 8, 1997, by and between ATSI and Diablo Communications of Southern California, Inc., a California corporation. (Schedules and Exhibits omitted).................... (*10.21) 10.16 Asset Purchase Agreement, dated as of July 8, 1997, by and between ATS and Suburban Cable T.V. Co....... (*10.22) 10.17 Stock Purchase Agreement, date as of September 30, 1997, by and between ATSI, OPM-USA-INC., a Florida corporation ("OPM"), and the Stockholders of OPM. (Schedules and Exhibits omitted).................... (*10.24) 10.18 Asset Purchase Agreement, dated as of October 4, 1997, by and between ATSI and Tucson Communications Company, L.P., a California limited partnership. (Schedules and Exhibits omitted).................... (*10.25) 10.19 American Tower Systems Corporation 1997 Stock Option Plan, dated as of November 5, 1997, as amended and restated on April 28, 1998.......................... (+10.26) 10.20 American Tower Systems Corporation Stock Purchase Agreement, dated as of January 8, 1998, by and among ATS and the Purchasers.............................. (*10.27) 10.21 Employment Agreement, dated as of January 22, 1988, by and between ATSI and J. Michael Gearon, Jr....... (*10.28) 10.22 Letter of Agreement, dated as of April 13, 1998, by and between ATC and Douglas Wiest................... (+++10.22) 10.23 ARS-ATS Separation Agreement, dated as of June 4, 1998 by and among American Radio Systems Corporation, a Delaware Corporation ("ARS"), ATS, and CBS Corporation................................. (++10.30) 10.24 Registration Rights Agreement, dated as of January 22, 1998, by and among ATC and each of the Parties Incorporated named therein....................................... by reference to Exhibit 10.3 from the Company's Quarterly Report on Form 10-Q (File No. 001-14194) dated August 14, 1998 21 Subsidiaries of ATC.................................. (+++21) 23.0 Consent of Sullivan & Worcester LLP.................. Contained in the opinion of Sullivan & Worcester LLP filed herewith as part of Exhibit 5 23.1 Independent Auditors' Consent--Deloitte & Touche (++++ Exhibit LLP................................................. 23.1)
Exhibit Exhibit File No. Description of Document No. ------- ----------------------- -------------- 23.2 Consent of Pressman Ciocca Smith LLP................... (++++ 23.2) 23.3 Consent of Rooney, Ida, Nolt & Ahern................... (++++ 23.3) 23.4 Consent of Ernst & Young LLP........................... (++++ 23.4) 23.5 Consent of KPMG LLP.................................... (++++ 23.5) 23.6 Consent of Bill Mitts, Inc. ........................... Filed herewith as Exhibit 23.6 23.7 Consent of Arthur Andersen LLP......................... (++++ 23.7) 23.8 Consent of Gollob, Morgan, Peddy & Co., P.C............ (++++ 23.8) 23.9 Consent of KPMG LLP ................................... (++++ 23.9) 23.10 Consent of Ernst & Young LLP .......................... (++++ 23.10) 23.11 Consent of KPMG LLP.................................... (++++ 23.11) 24 Power of Attorney...................................... (++++ filed previously as page II-7 of the Registration Statement) 99.1 Consent of Director Nominee, Jack D. Furst............. (++++ 99.1) 99.2 Consent of Director Nominee, Dean H. Eisner............ (++++ 99.2)

 
                               19,300,000 Shares

                          AMERICAN TOWER CORPORATION

                Class A Common Stock, par value $.01 per share


                            UNDERWRITING AGREEMENT
                            ----------------------


                                                     February __, 1999



Credit Suisse First Boston Corporation,
BT Alex. Brown Incorporated,
Lehman Brothers Inc.,
Morgan Stanley & Co. Incorporated,
Salomon Smith Barney Inc.,
Bear, Stearns & Co. Inc.,
Merrill Lynch, Pierce, Fenner & Smith
         Incorporated,

                 and

NationsBanc Montgomery Securities LLC,

As Representatives of the Several Underwriters (the "Representatives"),
c/o Credit Suisse First Boston Corporation,
Eleven Madison Avenue
New York, N.Y. 10010-3629.

Dear Sirs:

          1.  Introductory.  American Tower Corporation, a Delaware corporation
("Company"), proposes to issue and sell 18,000,000 shares of its Class A Common
Stock, par value $.01 per share ("Class A Common Stock" or, together with the
Class C Common Stock, "Securities"), and the stockholders listed in Schedule A
hereto (collectively, "Selling Stockholders") propose severally to sell an
aggregate of 1,300,000 outstanding shares of Class A Common Stock and Class C
Common Stock, par value $.01 per share ("Class C Common Stock"), each such
Selling Stockholder selling the number of shares of Class A or Class C Common
Stock set forth with its name on Schedule A (such 19,300,000 shares of
Securities being hereinafter referred to as the "Firm Securities").  The Company
also proposes to sell to the Underwriters, at the option of the Underwriters, an
aggregate of not more than 1,930,000 additional shares of its Securities, as set
forth below (such 1,930,000 additional shares being hereinafter referred to as
the "Optional Securities"). The Firm Securities and the Optional Securities are
herein collectively called the "Offered Securities".  The Company and the
Selling Stockholders hereby agree with the several Underwriters named in
Schedule B hereto ("Underwriters") as hereinafter set forth.

                                       1

 
          2.  Representations and Warranties of the Company and the Selling
Stockholders.  (a) The Company represents and warrants to, and agrees with, the
several Underwriters that:

          (i) A registration statement (No. 333-70881) relating to the Offered
     Securities, including a form of prospectus, has been filed with the
     Securities and Exchange Commission ("Commission") and either (A) has been
     declared effective under the Securities Act of 1933 (the "Act") and is not
     proposed to be amended or (B) is proposed to be amended by amendment or
     post-effective amendment. If such registration statement (the "initial
     registration statement") has been declared effective, either (A) an
     additional registration statement (the "additional registration statement")
     relating to the Offered Securities may have been filed with the Commission
     pursuant to Rule 462(b) ("Rule 462(b)") under the Act and, if so filed, has
     become effective upon filing pursuant to such Rule and the Offered
     Securities all have been duly registered under the Act pursuant to the
     initial registration statement and, if applicable, the additional
     registration statement or (B) such an additional registration statement is
     proposed to be filed with the Commission pursuant to Rule 462(b) and will
     become effective upon filing pursuant to such Rule and upon such filing the
     Offered Securities will all have been duly registered under the Act
     pursuant to the initial registration statement and such additional
     registration statement. If the Company does not propose to amend the
     initial registration statement or if an additional registration statement
     has been filed and the Company does not propose to amend it, and if any
     post-effective amendment to either such registration statement has been
     filed with the Commission prior to the execution and delivery of this
     Agreement, the most recent amendment (if any) to each such registration
     statement has been declared effective by the Commission or has become
     effective upon filing pursuant to Rule 462(c) ("Rule 462(c)") under the Act
     or, in the case of the additional registration statement, Rule 462(b). For
     purposes of this Agreement, "Effective Time" with respect to the initial
     registration statement or, if filed prior to the execution and delivery of
     this Agreement, the additional registration statement means (A) if the
     Company has advised the Representatives that it does not propose to amend
     such registration statement, the date and time as of which such
     registration statement, or the most recent post-effective amendment thereto
     (if any) filed prior to the execution and delivery of this Agreement, was
     declared effective by the Commission or has become effective upon filing
     pursuant to Rule 462(c), or (B) if the Company has advised the
     Representatives that it proposes to file an amendment or post-effective
     amendment to such registration statement, the date and time as of which
     such registration statement, as amended by such amendment or post-effective
     amendment, as the case may be, is declared effective by the Commission. If
     an additional registration statement has not been filed prior to the
     execution and delivery of this Agreement but the Company has advised the
     Representatives that it proposes to file one, "Effective Time" with respect
     to such additional registration statement means the date and time as of
     which such registration statement is filed and becomes effective pursuant
     to Rule 462(b). "Effective Date" with respect to the initial registration
     statement or the additional registration statement (if any) means the date
     of the Effective Time thereof. The initial registration statement, as
     amended at its Effective Time, including all information contained in the
     additional registration statement (if any) and deemed to be a part of the
     initial registration statement as of the Effective Time of the additional
     registration statement pursuant to the General Instructions of the Form on
     which it is filed and including all information (if any) deemed to be a
     part of the initial registration statement as of its Effective Time
     pursuant to Rule 430A(b) ("Rule 430A(b)") under the Act, is hereinafter
     referred to as the "Initial Registration Statement". The additional
     registration statement, as amended at its Effective Time, including the
     contents of the initial registration statement incorporated by reference
     therein and including all information (if any) deemed to be a part of the
     additional registration statement as of its Effective Time pursuant to Rule
     430A(b), is hereinafter referred to as the "Additional Registration

                                       2

 
     Statement". The Initial Registration Statement and the Additional
     Registration Statement are hereinafter referred to collectively as the
     "Registration Statements" and individually as a "Registration Statement".
     The form of prospectus relating to the Offered Securities, as first filed
     with the Commission pursuant to and in accordance with Rule 424(b) ("Rule
     424(b)") under the Act or (if no such filing is required) as included in a
     Registration Statement, is hereinafter referred to as the "Prospectus". No
     document has been or will be prepared or distributed in reliance on Rule
     434 under the Act.

          (ii) If the Effective Time of the Initial Registration Statement is
     prior to the execution and delivery of this Agreement: (A) on the Effective
     Date of the Initial Registration Statement, the Initial Registration
     Statement conformed in all material respects to the requirements of the Act
     and the rules and regulations of the Commission ("Rules and Regulations")
     and did not include any untrue statement of a material fact or omit to
     state any material fact required to be stated therein or necessary to make
     the statements therein not misleading, (B) on the Effective Date of the
     Additional Registration Statement (if any), each Registration Statement
     conformed, or will conform, in all material respects to the requirements of
     the Act and the Rules and Regulations and did not include, or will not
     include, any untrue statement of a material fact and did not omit, or will
     not omit, to state any material fact required to be stated therein or
     necessary to make the statements therein not misleading, and (C) on the
     date of this Agreement, the Initial Registration Statement and, if the
     Effective Time of the Additional Registration Statement is prior to the
     execution and delivery of this Agreement, the Additional Registration
     Statement each conforms, and at the time of filing of the Prospectus
     pursuant to Rule 424(b) or (if no such filing is required) at the Effective
     Date of the Additional Registration Statement in which the Prospectus is
     included, each Registration Statement and the Prospectus will conform, in
     all material respects to the requirements of the Act and the Rules and
     Regulations, and neither of such documents includes, or will include, any
     untrue statement of a material fact or omits, or will omit, to state any
     material fact required to be stated therein or necessary to make the
     statements therein not misleading. If the Effective Time of the Initial
     Registration Statement is subsequent to the execution and delivery of this
     Agreement: on the Effective Date of the Initial Registration Statement, the
     Initial Registration Statement and the Prospectus will conform in all
     material respects to the requirements of the Act and the Rules and
     Regulations, neither of such documents will include any untrue statement of
     a material fact or will omit to state any material fact required to be
     stated therein or necessary to make the statements therein not misleading
     (in light of the circumstances under which it was made, in the case of the
     Prospectus), and no Additional Registration Statement has been or will be
     filed. The two preceding sentences do not apply to statements in or
     omissions from a Registration Statement or the Prospectus based upon
     written information furnished to the Company by any Underwriter through the
     Representatives specifically for use therein.

          (iii)  The Company has been duly incorporated and is an existing
     corporation in good standing under the laws of the State of Delaware, with
     power and authority (corporate and other) to own its properties and conduct
     its business as described in the Prospectus; and the Company is duly
     qualified to do business as a foreign corporation in good standing in all
     other jurisdictions in which its ownership or lease of property or the
     conduct of its business requires such qualification.

          (iv) Each subsidiary of the Company has been duly incorporated (or
     formed, as the case may be) and is an existing corporation (or limited
     partnership or limited liability company, as the case may be) in good
     standing under the laws of the jurisdiction of its incorporation or
     formation, with power and authority (corporate and other) to own its
     properties and conduct its business as described in the Prospectus; and
     each subsidiary of the Company is duly qualified to do business as a
     foreign corporation in good standing in all other jurisdictions in which
     its ownership or lease of property or the conduct of its business requires
     such qualification except where failure to so qualify would not,
     individually or in the aggregate have a material adverse effect on the
     Company

                                       3

 
     and its subsidiaries taken as a whole; all of the issued and outstanding
     capital stock (or partnership or other equity interests) of each subsidiary
     of the Company has been duly authorized and validly issued and is fully
     paid (except for any general partnership interest) nonassessable; and,
     except for the pledge pursuant to the Credit Agreements (as defined herein)
     as disclosed in the Prospectus, the capital stock (and partnership and
     other equity interests) of each subsidiary owned by the Company, directly
     or through subsidiaries, is owned free from liens, encumbrances and
     defects.

          (v) The Offered Securities and all other outstanding shares of capital
     stock of the Company have been duly authorized and validly issued, are
     fully paid and nonassessable and conform to the description thereof
     contained in the Prospectus. The Offered Securities and all other
     outstanding shares of capital stock of the Company have been duly
     authorized; all outstanding shares of capital stock of the Company
     (including the Offered Securities being sold by the Selling Stockholders)
     are, and, when the Offered Securities being sold by the Company have been
     delivered and paid for in accordance with this Agreement on each Closing
     Date (as defined below), such Offered Securities will have been, validly
     issued, fully paid and nonassessable, and conform or will conform to the
     descriptions thereof contained in the Prospectus; and the stockholders of
     the Company do not and will not have any preemptive rights with respect to
     any of such securities.

          (vi) Except as disclosed in the Prospectus, there are no contracts,
     agreements or understandings between the Company and any person that would
     give rise to a valid claim against the Company or any Underwriter for a
     brokerage commission, finder's fee or other like payment in connection with
     the offering of the Offered Securities.

          (vii)  Except as disclosed in the Prospectus, there are no contracts,
     agreements or understandings between the Company and any person granting
     such person the right to require the Company to file a registration
     statement under the Act with respect to any outstanding securities of the
     Company owned or to be owned by such person or to require the Company to
     include such securities in the securities registered pursuant to a
     Registration Statement or in any securities being registered pursuant to
     any other registration statement filed by the Company under the Act.

          (viii)  The Offered Securities have been approved for listing, subject
     in the case of the Offered Securities being sold by the Company, to notice
     of issuance, on the New York Stock Exchange ("NYSE").

          (ix) No consent, approval, authorization, order or waiver of, or
     filing with, any governmental agency or body or any court is required to be
     obtained or made by the Company or any subsidiary of the Company for the
     consummation of the transactions contemplated by this Agreement in
     connection with the sale of the Offered Securities, except (i) such as have
     been obtained and made under the Act and (ii) such as may be required under
     state securities laws.

          (x) The execution, delivery and performance of this Agreement and the
     consummation of the transactions herein contemplated will not result in a
     breach or violation of any of the terms and provisions of, or constitute a
     default under, any statute, any rule, regulation, order or policy of any
     governmental agency or body or any court, domestic or foreign, having
     jurisdiction over the Company or any subsidiary of the Company or any of
     their properties, the Credit Agreements, each dated as of June 16, 1998,
     among the Company, American Towers, Inc. and American Tower L.P.,
     respectively, and  Toronto Dominion (Texas) Inc. as Administrative Agent,
     and the other lenders under each such agreement (as heretofore amended, the
     "Credit Agreements") or any other agreement or instrument to which the
     Company or any such subsidiary is a party or by which the Company or any
     such subsidiary is bound, or to which any of the properties of the Company
     or any such subsidiary is subject, or the charter or by-laws (or other
     constituent document) of the Company or any such subsidiary.

          (xi) This Agreement has been duly authorized, executed and delivered
     by the Company.

                                       4

 
          (xii)  Except as disclosed in the Prospectus or as would not,
     individually or in the aggregate have a material adverse effect on the
     Company or its subsidiaries taken as a whole, the Company and its
     subsidiaries have good and marketable title to all real properties and all
     other properties and assets owned by them, in each case free from liens,
     encumbrances and defects that would materially affect the value thereof or
     materially interfere with the use made or to be made thereof by them; and
     except as disclosed in the Prospectus, the Company and its subsidiaries
     hold any leased real or personal property under valid and enforceable
     leases with no exceptions that would materially interfere with the use made
     or to be made thereof by them.

          (xiii)  No labor dispute with the employees of the Company or any
     subsidiary exists or, to the knowledge of the Company, is imminent that
     might have a material adverse effect on the Company and its subsidiaries
     taken as a whole.

          (xiv)  The Company and its subsidiaries own, possess or can acquire on
     reasonable terms, adequate trademarks, trade names and other rights to
     inventions, know-how, patents, copyrights, confidential information and
     other intellectual property (collectively, "intellectual property rights")
     necessary to conduct the business now operated by them, or presently
     employed by them, and have not received any notice of infringement of or
     conflict with asserted rights of others with respect to any intellectual
     property rights that, if determined adversely to the Company or any of its
     subsidiaries, would individually or in the aggregate have a material
     adverse effect on the Company and its subsidiaries taken as a whole.

          (xv) Neither the Company nor any of its subsidiaries is in violation
     of any statute, any rule, regulation, decision or order of any governmental
     agency or body or any court, domestic or foreign, relating to the use,
     disposal or release of hazardous or toxic substances or relating to the
     protection or restoration of the environment or human exposure to hazardous
     or toxic substances  (collectively, "environmental laws"), owns or operates
     any real property contaminated with any substance that is subject to any
     environmental laws, is liable for any off-site disposal or contamination
     pursuant to any environmental laws, or is subject to any claim relating to
     any environmental laws, which violation, contamination, liability or claim
     would individually or in the aggregate have a material adverse effect on
     the Company and its subsidiaries taken as a whole; and the Company is not
     aware of any pending investigation which might lead to such a claim.

          (xvi)  There are no pending actions, suits or proceedings against or
     affecting the Company, any of its subsidiaries or any of their respective
     properties that, if determined adversely to the Company or any of its
     subsidiaries, would individually or in the aggregate have a material
     adverse effect on the condition (financial or other), business, prospects
     or results of operations of the Company and its subsidiaries taken as a
     whole, or would materially and adversely affect the ability of the Company
     to perform its obligations under this Agreement, or which are otherwise
     material in the context of the sale of the Offered Securities; and, except
     as disclosed in the Prospectus, no such actions, suits or proceedings are
     threatened or, to the Company's knowledge, contemplated.

          (xvii)  The financial statements included in the Registration
     Statements and Prospectus present fairly the financial position of the
     Company and its consolidated subsidiaries and the other entities named
     therein as of the dates shown and their results of operations and cash
     flows for the periods shown, and such financial statements have been
     prepared in conformity with generally accepted accounting principles in the
     United States applied on a consistent basis; and the schedules included in
     the Registration Statements present fairly the information required to be
     stated therein.

          (xviii)  Except as disclosed in the Prospectus, since the date of the
     latest audited financial statements included in the Prospectus there has
     been no material adverse change, nor any development or event involving a
     prospective material adverse change, in the condition (financial

                                       5

 
     or other), business, properties or results of operations of the Company and
     its subsidiaries taken as a whole, and, except as disclosed in or
     contemplated by the Prospectus, there has been no dividend or distribution
     of any kind declared, paid or made by the Company on any class of its
     capital stock.

          (xix)  The Company is not and, after giving effect to the offering and
     sale of the Offered Securities and the application of the proceeds thereof
     as described in the Prospectus, will not be an "investment company" as
     defined in the Investment Company Act of 1940.

          (b) Each Selling Stockholder severally represents and warrants to, and
agrees with, the several Underwriters that:

          (i) Such Selling Stockholder has and on the First Closing Date
     hereinafter mentioned will have valid and unencumbered title to the Offered
     Securities to be delivered by such Selling Stockholder on such Closing Date
     and full right, power and authority to enter into this Agreement and to
     sell, assign, transfer and deliver the Offered Securities to be delivered
     by such Selling Stockholder on such Closing Date hereunder; and upon the
     delivery of and payment for the Offered Securities on such Closing Date
     hereunder the several Underwriters will acquire valid and unencumbered
     title to the Offered Securities to be delivered by such Selling Stockholder
     on such Closing Date.

          (ii) All information furnished, or to be furnished, in writing to the
     Company by the Selling Stockholder regarding the Selling Stockholder
     specifically for use in the Registration Statement is on the date of this
     Agreement, and will be on the Closing Date, true and correct in all
     material respects and does not on the date of this Agreement, and will not
     on the Closing Date, contain any untrue statement of a material fact or
     omit any material fact required to be stated therein or necessary to make
     the statements therein not misleading.

          (iii)  The execution and delivery by such Selling Stockholder of, and
     the performance by such Selling Stockholder of its obligations under this
     Agreement, the Custody Agreement hereinafter referred to and the Power of
     Attorney appointing certain individuals as such Selling Stockholder's
     attorneys-in-fact to the extent set forth therein (the "Power of Attorney")
     will not result in a breach or violation of any of the terms or provisions
     of, or constitute a default under, the certificate of incorporation or
     bylaws or agreement of limited partnership of such Selling Stockholder (if
     such Selling Stockholder is a corporation or limited partnership) or any
     statute, rule, regulation or order of any governmental agency or body or
     any court having jurisdiction over such Selling Stockholder or any of its
     properties, or any agreement or instrument to which such Selling
     Stockholder is a party or by which it is bound or to which any of its
     properties is subject, or the constituent documents, if any, of such
     Selling Stockholder.

          (iv) No consent, approval, authorization, order or waiver of, or
     filing with, any governmental agency or body or any court is required to be
     obtained or made by such Selling Stockholder for the sale of the Offered
     Securities to be sold by such Selling Stockholder or the performance by
     such Selling Stockholder of its obligations under this Agreement or the
     Power of Attorney or Custody Agreement of such Selling Stockholder, except
     such as have been obtained and made under the Act.

          (v) This Agreement has been duly authorized, executed and delivered by
     or on behalf of such Selling Stockholder and the Power of Attorney and the
     Custody Agreement have been duly authorized, executed and delivered by such
     Selling Stockholder and are its valid and binding agreements (subject to
     bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and
     similar laws of general applicability relating to or affecting creditors'
     rights and to general equity principles).

                                       6

 
          3.  Purchase, Sale and Delivery of Offered Securities.  On the basis
of the representations, warranties and agreements herein contained, but subject
to the terms and conditions herein set forth, the Company and each Selling
Stockholder agree, severally and not jointly, to sell to each Underwriter, and
each Underwriter agrees, severally and not jointly, to purchase from the Company
and each Selling Stockholder, at a purchase price of $____ per share, that
number of Firm Securities (rounded up or down, as determined by Credit Suisse
First Boston Corporation ("CSFBC") in its discretion, in order to avoid
fractions) obtained by multiplying 19,300,000 Firm Securities in the case of the
Company and the number of Firm Securities set forth opposite the name of such
Selling Stockholder in Schedule A hereto, in the case of a Selling Stockholder,
in each case by a fraction the numerator of which is the number of Firm
Securities set forth opposite the name of such Underwriter in Schedule B hereto
and the denominator of which is the total number of Firm Securities.

          Certificates in negotiable form for any Common Stock of the Company to
be sold by Selling Stockholders hereunder have been placed in custody, for
delivery under this Agreement, under custody agreements (the "Custody
Agreements") made with Harris Trust and Savings Bank, as custodian (the
"Custodian").  Each Selling Stockholder agrees that the shares represented by
the certificates held in custody for the Selling Stockholders under the Custody
Agreements are subject to the interests of the Underwriters hereunder, that the
arrangements made by the Selling Stockholders for such custody are to that
extent irrevocable except as provided therein and in the Power of Attorney of
such Selling Stockholder, and that the obligations of the Selling Stockholders
hereunder shall not be terminated by operation of law, whether by the death of
any individual Selling Stockholder or the occurrence of any other event, or in
the case of a trust, by the death of any trustee or trustees or the termination
of such trust, or in the case of a corporation or partnership, by the
dissolution or liquidation of such corporation or partnership, or the occurrence
of any other event.  If any individual Selling Stockholder or any such trustee
or trustees should die, or if any such corporation or partnership should be
dissolved or liquidated or if any other such event should occur, or if any of
such trusts should terminate, before the delivery of the Offered Securities
hereunder, certificates for such Offered Securities shall be delivered by the
Custodian in accordance with the terms and conditions of this Agreement and the
Custody Agreements as if such death, dissolution, liquidation or other event or
termination had not occurred, regardless of whether or not the Custodian shall
have received notice of such death, dissolution, liquidation or other event or
termination.

          The Company and the Custodian will deliver the Firm Securities to the
Representatives for the accounts of the Underwriters, against payment of the
purchase price in Federal (same day) Funds by  wire transfer in U.S. Dollars to
an account at a bank acceptable to CSFBC drawn to the order of the Company in
the case of 18,000,000 shares of Firm Securities and to the order of the
Custodian in the case of 1,300,000 shares of Firm Securities, at the office of
Sullivan & Cromwell, 125 Broad Street, New York, New York at 9:30 A.M., New York
time, February __, 1999 or at such other date and time not later than seven full
business days thereafter as CSFBC and the Company determine, such time being
herein referred to as the "First Closing Date."  The certificates for the Firm
Securities so to be delivered will be in definitive form, in such denominations
and registered in such names as CSFBC requests and will be made available for
checking and packaging at the New York office of Harris Trust and Savings Bank
at least 24 hours prior to the First Closing Date.

          In addition, upon written notice from CSFBC given to the Company from
time to time not more than thirty days subsequent to the date of the Prospectus,
the Underwriters may purchase all or less than all of the Optional Securities at
the purchase price per share to be paid for the Firm Securities.  The Company
agrees to sell to the Underwriters the number of Optional Securities specified
in such notice and the Underwriters agree, severally and not jointly, to
purchase such Optional Securities.  Such Optional Securities shall be purchased
for the account of each Underwriter in the same proportion as the number of Firm
Securities set forth opposite such Underwriter's name bears to the total number
of Firm Securities (subject to adjustment by CSFBC to eliminate fractions) and
may be purchased by the Underwriters only 

                                       7

 
for the purpose of covering over-allotments made in connection with the sale of
the Firm Securities. No Optional Securities shall be sold or delivered unless
the Firm Securities previously have been, or simultaneously are, sold and
delivered. The right to purchase the Optional Securities or any portion thereof
may be exercised from time to time and to the extent not previously exercised
may be surrendered and terminated at any time upon notice by CSFBC to the
Company.

          Each time for the delivery of and payment for the Optional Securities,
being herein referred to as an "Optional Closing Date", which may be the First
Closing Date (the First Closing Date and each Optional Closing Date, if any,
being sometimes referred to as a "Closing Date"), shall be determined by CSFBC
but shall not be later than seven full business days after written notice of
election to purchase Optional Securities is given. The Company will deliver the
Optional Securities being purchased on each Optional Closing Date to the
Representatives for the accounts of the several Underwriters, against payment of
the purchase price therefor in Federal (same day) Funds by wire transfer to an
account at a bank acceptable to CSFBC drawn to the order of the Company, at the
above office of Sullivan & Cromwell.  The certificates for the Optional
Securities being purchased on each Optional Closing Date will be in definitive
form, in such denominations and registered in such names as CSFBC requests upon
reasonable notice prior to such Optional Closing Date and will be made available
for checking and packaging at the New York office of Harris Trust and Savings
Bank at a reasonable time in advance of such Optional Closing Date.

          4.  Offering by Underwriters.  It is understood that the several
Underwriters propose to offer the Offered Securities for sale to the public as
set forth in the Prospectus.

          5.  Certain Agreements of the Company and the Selling Stockholders.
The Company agrees with the several Underwriters and the Selling Stockholders
that:

          (a) The Company will file the Prospectus with the Commission pursuant
     to and in accordance with subparagraph (1) (or, if applicable and if
     consented to by CSFBC, subparagraph (4)) of Rule 424(b) not later than the
     earlier of (A) the second business day following the execution and delivery
     of this Agreement or (B) the fifteenth business day after the Effective
     Date of the Initial Registration Statement.

          The Company will advise CSFBC promptly of any such filing pursuant to
     Rule 424(b).

          (b) The Company will advise CSFBC promptly of any proposal to amend or
     supplement the initial or any additional registration statement as filed or
     the related prospectus or the Initial Registration Statement, the
     Additional Registration Statement (if any) or the Prospectus and will not
     effect such amendment or supplementation without CSFBC's consent; and the
     Company will also advise CSFBC promptly of any amendment or supplementation
     of a Registration Statement or of the Prospectus and of the institution by
     the Commission of any stop order proceedings in respect of a Registration
     Statement and will use its best efforts to prevent the issuance of any such
     stop order and to obtain as soon as possible its lifting, if issued.

          (c) If, at any time when a prospectus relating to the Offered
     Securities is required to be delivered under the Act in connection with
     sales by any Underwriter or dealer, any event occurs as a result of which
     the Prospectus as then amended or supplemented would include an untrue
     statement of a material fact or omit to state any material fact necessary
     to make the statements therein, in the light of the circumstances under
     which they were made, not misleading, or if it is necessary at any time to
     amend the Prospectus to comply with the Act, the Company will promptly
     notify CSFBC of such event and will promptly prepare and file with the
     Commission, at its own expense, an amendment or supplement that will
     correct such statement or omission or an amendment that will effect such
     compliance.  Neither CSFBC's consent to, nor the Underwriters' delivery of,
     any such amendment or supplement shall constitute a waiver of any of the
     conditions set forth in Section 6.

                                       8

 
          (d) As soon as practicable, but not later than the Availability Date
     (as defined below), the Company will make generally available to its
     securityholders an earnings statement covering a period of at least 12
     months beginning after the Effective Date of the Initial Registration
     Statement  which will satisfy the provisions of Section 11(a) of the Act.
     For the purpose of the preceding sentence, "Availability Date" means the
     45th day after the end of the fourth fiscal quarter following the fiscal
     quarter that includes the Effective Date, except that, if such fourth
     fiscal quarter is the last quarter of the Company's fiscal year,
     "Availability Date" means the 90th day after the end of such fourth fiscal
     quarter.

          (e) The Company will furnish to the Representatives copies of each
     Registration Statement (nine of which will be signed, or will be
     photocopies of signed ones in the case of the Initial Registration
     Statement, and will include all exhibits), each related preliminary
     prospectus and, so long as delivery of a prospectus relating to the Offered
     Securities is required to be delivered under the Act in connection with
     sales by any Underwriter or dealer, the Prospectus and all amendments and
     supplements to such documents, in each case as soon as available and in
     such quantities as CSFBC requests. The Company will pay the expenses of
     printing and distributing to the Underwriters all such documents.

          (f) The Company will arrange for the qualification of the Offered
     Securities for sale under the laws of such jurisdictions as CSFBC
     designates and will continue such qualifications in effect so long as
     required for the distribution; provided, that the Company shall not be
     required to qualify as a foreign corporation or to file a general consent
     to service of process or to subject itself to taxation generally in any
     jurisdiction.

          (g) During the period of five years hereafter, the Company will
     furnish to the Representatives and, upon request, to each of the other
     Underwriters, as soon as practicable after the end of each fiscal year, a
     copy of its annual report to stockholders for such year; and the Company
     will furnish to the Representatives (i) as soon as available, a copy of
     each report and any definitive proxy statement of the Company filed with
     the Commission under the Securities Exchange Act of 1934 or mailed to
     stockholders, and (ii) from time to time, such other information concerning
     the Company as CSFBC may reasonably request.

          (h) For a period of 120 days after the date of the initial public
     offering of the Offered Securities, the Company will not offer, sell,
     contract to sell, pledge or otherwise dispose of, directly or indirectly,
     or file with the Commission a registration statement under the Act relating
     to, any additional shares of its Securities, or securities convertible into
     or exchangeable or exercisable for any Securities, or disclose the
     intention to make any such offer, sale, pledge, disposal or filing, without
     the prior written consent of CSFBC, except with respect to private
     issuances of Securities (or securities convertible into or exchangeable for
     Securities) or in connection with acquisitions, if the holders thereof
     agree to be bound by the foregoing 120-day restriction to the same extent
     as the Company, grants of employee stock options pursuant to the terms of a
     plan in effect on the date hereof, issuances of Securities pursuant to the
     exercise of  stock options outstanding on the date hereof or granted
     pursuant to the terms of a plan in effect on the date hereof, issuances of
     Securities pursuant to any dividend reinvestment plan of the Company or
     issuances of Securities upon conversion of Class B Common Stock or Class C
     Common Stock.


     The Company and each Selling Stockholder agree with the several
Underwriters that the Company will pay all expenses incident to the performance
of the obligations of the Company and the Selling Stockholders under this
Agreement (including, without limitation, the fees and expenses of counsel to
the Selling Stockholders and the fees and expenses of the Custodian), and that
the Company will reimburse the Underwriters (if and to the extent incurred by
them) for any filing fees and other expenses (including fees and disbursements
of counsel) incurred by them in connection with qualification of the Offered
Securities

                                       9

 
for sale under the laws of such jurisdictions as CSFBC designates and the
printing of memoranda relating thereto, for the filing fee of the National
Association of Securities Dealers, Inc. relating to the Offered Securities, for
any travel expenses of the Company's officers and employees and any other
expenses of the Company in connection with attending or hosting meetings with
prospective purchasers of the Offered Securities, and for expenses incurred in
distributing preliminary prospectuses and the Prospectus (including any
amendments and supplements thereto) to the Underwriters, provided that the
Selling Stockholders shall be responsible for the payment of any transfer taxes
on the sale by the Selling Stockholders of the Offered Securities to the
Underwriters.

     Each Selling Stockholder agrees to deliver to CSFBC, attention:
Transactions Advisory Group, on or prior to the First Closing Date a properly
completed and executed United States Treasury Department Form W-9 (or other
applicable form or statement specified by Treasury Department regulations in
lieu thereof).

     Each Selling Stockholder agrees, for a period of 120 days after the date of
the initial public offering of the Offered Securities, not to offer, sell,
contract to sell, pledge or otherwise dispose of, directly or indirectly, any
additional shares of Securities (or securities convertible into or exchangeable
or exercisable for any securities), or disclose the intention to make any such
offer, sale, pledge or disposal, without the prior written consent of CSFBC,
except as otherwise contemplated under those certain "lock-up" letters delivered
in connection herewith by such Selling Stockholder to the Company and the
Representatives.

          6.  Conditions of the Obligations of the Underwriters.  The
obligations of the several Underwriters to purchase and pay for the Firm
Securities on the First Closing Date and the Optional Securities to be purchased
on each Optional Closing Date will be subject to the accuracy of the
representations and warranties on the part of the Company and the Selling
Stockholders herein, to the accuracy of the statements of Company officers made
pursuant to the provisions hereof, to the performance by the Company and the
Selling Stockholders of their obligations hereunder and to the following
additional conditions precedent:

          (a) The Representatives shall have received a letter, dated the date
     of delivery thereof (which shall be on or prior to the date of this
     Agreement), of Deloitte & Touche LLP confirming that they are independent
     public accountants within the meaning of the Act and the applicable
     published Rules and Regulations thereunder and stating in effect that:

               (i)  in their opinion the financial statements and schedules
          examined by them and included in the Registration Statements comply in
          form in all material respects with the applicable accounting
          requirements of the Act and the related published Rules and
          Regulations;

               (ii)  they have performed the procedures specified by the
          American Institute of Certified Public Accountants for a review of
          interim financial information as described in Statement of Auditing
          Standards No. 71, Interim Financial Information, on the unaudited
          financial statements included in the Registration Statements;

               (iii)  on the basis of the review referred to in clause (ii)
          above, a reading of the latest available interim consolidated
          financial statements of the Company, inquiries of officials of the
          Company who have responsibility for financial and accounting matters
          and other specified procedures, nothing came to their attention that
          caused them to believe that:

                    (A) the selected combined financial data included in the
               Prospectus for each of the three years ended December 31, 1997 do
               not agree with, or were not properly derived from, the amounts
               set forth in each of the constituent companies' selected
               financial data included in the Prospectus for those same periods;

                                       10

 
                    (B) the selected financial data included in the Prospectus
               for each of the three years ended December 31, 1997 do not agree
               with, or were not properly derived from, the amounts set forth in
               the audited financial statements of the Company for those same
               periods or were not determined on a basis substantially
               consistent with that of the corresponding amounts in the audited
               financial statements included in the Prospectus;

                    (C) the unaudited financial statements included in the
               Registration Statements do not comply in form in all material
               respects with the applicable accounting requirements of the Act
               and the related published Rules and Regulations or any material
               modifications should be made to such unaudited financial
               statements for them to be in conformity with generally accepted
               accounting principles;

                    (D) the unaudited consolidated financial statements for the
               nine month periods ended September 30, 1998 and September 30,
               1997 included in the Prospectus do not agree with the amounts set
               forth in the unaudited financial statements for those same
               periods or were not determined on a basis substantially
               consistent with that of the audited consolidated financial
               statements; at the date of the latest available balance sheet
               read by such accountants, or at a subsequent specified date not
               more than five days prior to the date of this Agreement, there
               was any change in the capital stock or any increase in short-term
               debt or long-term debt of the Company and its consolidated
               subsidiaries or, at the date of the latest available balance
               sheet read by such accountants, there was any decrease in
               consolidated net current assets or net assets, as compared with
               amounts shown on the latest balance sheet included in the
               Prospectus;

                    (E) for the period from the closing date of the latest
               statement of operations included in the Prospectus to the closing
               date of the latest available statement of operations read by such
               accountants there were any decreases, as compared with the
               corresponding period of the previous year and with the period of
               corresponding length ended the date of the latest Consolidated
               Statement of Operations included in the Prospectus, in
               consolidated net revenues, operating income (defined as net
               revenues less operating expenses, excluding depreciation,
               amortization and corporate expenses) or in other income and
               expense, net, or in the total or per share amounts of
               consolidated net income; or

                    (F) the pro forma financial data set forth in the Prospectus
               does not comply in form in all material respects to the
               applicable accounting requirements of the Act and the related
               Rules and Regulations or the pro forma adjustments have not been
               properly applied to the historical amounts in the compilation of
               that data; except in all cases set forth in clauses (D) and (E)
               above for changes, increases or decreases which the Prospectus
               discloses have occurred or may occur or which are described in
               such letter; and

               (iv)  they have compared specified dollar amounts (or percentages
          derived from such dollar amounts) and other financial information
          contained or incorporated by reference in the Registration Statements
          (in each case to the extent that such dollar amounts, percentages and
          other financial information are derived from the general accounting
          records of the Company, its subsidiaries and other entities whose
          financial statements are included in the Prospectus subject to the
          internal controls of the Company's or such entities' accounting system
          or are derived directly from such records by analysis or computation)
          with the results obtained from inquiries, a reading of such general
          accounting records and other procedures specified in such letter and
          have found such dollar amounts, percentages and other financial
          information to be in agreement with such results, except as otherwise
          specified in such letter.

                                       11

 
          (b) The Representatives shall have received letters, dated the date of
     delivery thereof (which shall be on or prior to the date of this
     Agreement), of Pressman Ciocca Smith LLP, Rooney, Ida, Nolt & Ahern, KPMG
     LLP, Arthur Andersen LLP, Bill Mitts, Inc., Gollob, Morgan, Peddy & Co.,
     P.C. and Ernst & Young LLP, in each case confirming that they are
     independent public accountants within the meaning of the Act and the
     applicable Rules and Regulations thereunder, and stating in effect that:

               (i)  in their opinion the financial statements and schedules
          examined by them and included in the Registration Statements comply in
          form in all material respects with the applicable accounting
          requirements of the Act and the related published Rules and
          Regulations; and

               (ii)  they have compared specified dollar amounts (or percentages
          derived from such dollar amounts) and other financial information
          contained in the Registration Statements (in each case to the extent
          that such dollar amounts, percentages and other financial information
          are derived from the general accounting records of the entity whose
          financial statements they have audited subject to the internal
          controls of such entity's accounting system or are derived directly
          from such records by analysis or computation) with the results
          obtained from inquiries, a reading of such general accounting records
          and other procedures specified in such letter and have found such
          dollar amounts, percentages and other financial information to be in
          agreement with such results, except as otherwise specified in such
          letter.

          (c) The Prospectus shall have been filed with the Commission in
     accordance with the Rules and Regulations and Section 5(a) of this
     Agreement.  Prior to such Closing Date, no stop order suspending the
     effectiveness of either Registration Statement shall have been issued and
     no proceedings for that purpose shall have been instituted or, to the
     knowledge of any Selling Stockholder, the Company or the Representatives,
     shall be contemplated by the Commission.

          (d) Subsequent to the execution and delivery of this Agreement, there
     shall not have occurred (i) any change, or any development or event
     involving a prospective change, in the condition (financial or other),
     business, properties or results of operations of the Company or any of its
     subsidiaries which, in the judgment of a majority in interest of the
     Underwriters including the Representatives, is material and adverse and
     makes it impractical or inadvisable to proceed with completion of the
     public offering or the sale of and payment for the Offered Securities; (ii)
     any downgrading in the rating of any debt securities of the Company, by any
     "nationally recognized statistical rating organization" (as defined for
     purposes of Rule 436(g) under the Act), or any public announcement that any
     such organization has under surveillance or review its rating of any debt
     securities of the Company (other than an announcement with positive
     implications of a possible upgrading, and no implication of a possible
     downgrading, of such rating); (iii) any suspension or limitation of trading
     in securities generally on the New York Stock Exchange, or any setting of
     minimum prices for trading on such exchange, or any suspension of trading
     of any securities of the Company on any exchange or in the over-the-counter
     market; (iv) any banking moratorium declared by Federal or New York
     authorities; or (v) any outbreak or escalation of major hostilities in
     which the United States is involved, any declaration of war by Congress or
     any other substantial national or international calamity or emergency if,
     in the judgment of a majority in interest of the Underwriters including the
     Representatives, the effect of any such outbreak, escalation, declaration,
     calamity or emergency makes it impractical or inadvisable to proceed with
     completion of the public offering or the sale of and payment for the
     Offered Securities.

                                       12

 
          (e) The Representatives shall have received an opinion, dated such
     Closing Date, of Sullivan & Worcester LLP, counsel for the Company, to the
     effect that:

               (i)  Each of the Company and the subsidiaries listed on Annex I
          hereto has been duly incorporated (or formed, as the case may be) and
          each of the Company and its subsidiaries is an existing corporation
          (or limited partnership or limited liability company, as the case may
          be) in good standing under the laws of the jurisdiction of its
          incorporation or formation, with corporate, partnership or limited
          liability company power and authority to own its properties and
          conduct its business as described in the Prospectus, and is duly
          qualified to do business as a foreign corporation (or other entity) in
          good standing in all other jurisdictions in which its ownership or
          lease of property or the conduct of its business requires such
          qualification, except where the failure to be so qualified would not
          individually or in the aggregate have a material adverse effect on the
          Company and its subsidiaries taken as a whole;

               (ii)  The Offered Securities delivered on such Closing Date and
          all other outstanding shares of all classes of the capital stock of
          the Company have been duly authorized and validly issued, are fully
          paid and nonassessable and conform to the description thereof
          contained in the Prospectus under the caption "Description of Capital
          Stock"; and the stockholders of the Company have no preemptive rights
          with respect to the Offered Securities;

               (iii)  Except as described in the Prospectus, there are no
          contracts, agreements or understandings known to such counsel between
          the Company and any person granting such person the right to require
          the Company to file a registration statement under the Act with
          respect to any securities of the Company owned or to be owned by such
          person or to require the Company to include such securities in the
          securities registered pursuant to the Registration Statement or in any
          securities being registered pursuant to any other registration
          statement filed by the Company under the Act;

               (iv)  No consent, approval, authorization, order or waiver of, or
          filing with, any governmental agency or body or any court is required
          to be obtained or made by the Company for the consummation of the
          transactions contemplated by this Agreement in connection with the
          sale of the Offered Securities, except such as have been obtained or
          made under the Act or under state securities laws or such as may be
          required under the Communications Act of 1934, as amended (the
          "Communications Act") (as to which such counsel need express no
          opinion);

               (v)  The execution, delivery and performance of this Agreement
          and the consummation of the transactions herein or therein
          contemplated will not result in a breach or violation of any of the
          terms and provisions of, or constitute a default under, any statute,
          any rule, regulation or order of any governmental agency or body or
          any court having jurisdiction over the Company, or any subsidiary of
          the Company or any of their properties, or, to such counsel's
          knowledge, any agreement or instrument to which the Company or any
          subsidiary of the Company is a party or by which the Company or any
          subsidiary of the Company is bound including, but not limited to, the
          Credit Agreements, and the Registration Rights Agreement, dated as of
          January 22, 1998, among the Company and the stockholders named
          therein, or to which any of the properties of the Company or any
          subsidiary of the Company is subject, or the charter or by-laws or
          other constituent document of the Company or any subsidiary of the
          Company, except that such counsel need not express any opinion with
          respect to the Communications Act or the rules, regulations and orders
          of the Federal Communications Commission (the "FCC") promulgated
          thereunder;

                                       13

 
               (vi)  The Initial Registration Statement was declared effective
          under the Act as of the date and time specified in such opinion, the
          Additional Registration Statement, satisfying the requirements of Rule
          462(b), was filed and became effective under the Act as of the date
          and (if determinable) time specified in such opinion, the Prospectus
          was filed with the Commission pursuant to the subparagraph of Rule
          424(b) specified in such opinion on the date specified therein or was
          included in the Initial Registration Statement or the Additional
          Registration Statement (as the case may be), and, to the best of the
          knowledge of such counsel, no stop order suspending the effectiveness
          of a Registration Statement or any part thereof has been issued and no
          proceedings for that purpose have been instituted or are pending or
          contemplated under the Act, and each Registration Statement and the
          Prospectus, and each amendment or supplement thereto, as of their
          respective effective or issue dates, complied as to form in all
          material respects with the requirements of the Act and the Rules and
          Regulations; such counsel have no reason to believe that any part of a
          Registration Statement or any amendment thereto, as of its effective
          date or as of such Closing Date, contained any untrue statement of a
          material fact or omitted to state any material fact required to be
          stated therein or necessary to make the statements therein not
          misleading; or that the Prospectus or any amendment or supplement
          thereto, as of its issue date or as of such Closing Date, contained
          any untrue statement of a material fact or omitted to state any
          material fact necessary in order to make the statements therein, in
          the light of the circumstances under which they were made, not
          misleading; the descriptions in each Registration Statement and the
          Prospectus of statutes, legal and governmental proceedings and
          contracts and other documents are accurate in all material respects
          and fairly present the information required to be shown; and such
          counsel do not know of any legal or governmental proceedings required
          to be described in either Registration Statement or the Prospectus
          which are not described as required or of any contracts or documents
          of a character required to be described in either Registration
          Statement or the Prospectus or to be filed as exhibits to either
          Registration Statement which are not described and filed as required;
          it being understood that such counsel need express no opinion as to
          the financial statements and schedules or other financial data
          contained in either Registration Statement or the Prospectus, except
          that such counsel need not express any opinion with respect to the
          Communications Act or the rules, regulations and orders of the FCC
          promulgated thereunder; and

               (vii)  This Agreement has been duly authorized, executed and
          delivered by the Company.

          (f) The Representatives shall have received an opinion, dated such
     Closing Date, of Michael Milsom, Esq., Vice President and General Counsel
     of the Company, to the effect that:

               (i)  No consent, approval, authorization, order or waiver of, or
          filing with, the FCC under the Communications Act and the published
          policies, rules and regulations of the FCC is required to be obtained
          or made for the consummation of the transactions contemplated by this
          Agreement in connection with the sale of the Offered Securities where
          the failure to obtain such consent, approval, authorization, order or
          waiver or to make such filing would have a material adverse effect on
          the Company and its subsidiaries taken as a whole;

               (ii) The execution, delivery and performance of this Agreement
          and the consummation of the transactions herein contemplated will not
          result in a breach or violation of any of the terms or provisions of,
          or constitute a default under (i) the Communications Act or any FCC
          regulation, rule, published policy or order that would have a material
          adverse effect on the Company and its subsidiaries taken as a whole;
          and

                                       14

 
               (iii)  To the knowledge of such counsel, there are no
          administrative or judicial proceedings pending before, or threatened
          by, the FCC with respect to the Company or any subsidiary of the
          Company, or any towers owned or operated by the Company or any
          subsidiary of the Company that, if determined adversely, could
          reasonably be expected to have a material adverse effect upon the
          Company and its subsidiaries taken as a whole.

          (g) The Representatives shall have received an opinion, of counsel to
     each of the Selling Stockholders as contemplated by and dated the date of
     the Power of Attorney and the opinion of such counsel substantially to the
     effect that each Selling Stockholder has as of the date of such opinion
     valid and unencumbered title to the Offered Securities to be delivered by
     such Selling Stockholder on the Closing Date and has full right, power and
     authority to sell, assign, transfer and deliver the Offered Securities to
     be delivered by such Selling Stockholder on such Closing Date hereunder;
     and upon consummation of the transactions contemplated hereby on the
     Closing the several Underwriters will acquire valid and unencumbered title
     to the Offered Securities to be purchased by them from the Selling
     Stockholders hereunder.

          (h)    The Representatives shall have received from Sullivan &
     Cromwell, counsel for the Underwriters, such opinion or opinions, dated
     such Closing Date, with respect to the incorporation of the Company, the
     validity of the Offered Securities delivered on such Closing Date, the
     Registration Statements, the Prospectus and other related matters as the
     Representatives may require, and the Company shall have furnished to such
     counsel such documents as they request for the purpose of enabling them to
     pass upon such matters.

          (i) The Representatives shall have received a certificate, dated such
     Closing Date, of the Chief Executive Officer of the Company and the Chief
     Financial Officer of the Company in which such officers, to the best of
     their knowledge after reasonable investigation, shall state that the
     representations and warranties of the Company in this Agreement are true
     and correct, that the Company has complied with all agreements and
     satisfied all conditions on its part to be performed or satisfied hereunder
     at or prior to such Closing Date, that no stop order suspending the
     effectiveness of any Registration Statement has been issued and no
     proceedings for that purpose have been instituted or are contemplated by
     the Commission, that, subsequent to the date of the most recent financial
     statements in the Prospectus, there has been no material adverse change,
     nor any development or event involving a prospective material adverse
     change, in the condition (financial or other), business, properties or
     results of operations of the Company and its subsidiaries taken as a whole
     except as set forth in or contemplated by the Prospectus or as described in
     such certificate, and that any additional Registration Statement was filed
     pursuant to Rule 462(b) under the Act, including payment of the applicable
     filing fee in accordance with Rule 111(a); such registration statement
     satisfied the requirements of subparagraphs (1) and (3) of Rule 462(b);
     such registration statement was filed prior to the time the Prospectus was
     printed and distributed; and no document has been prepared or distributed
     in reliance on Rule 434 under the Act.

          (j) The Representatives shall have received letters, dated such
     Closing Date, of Deloitte & Touche LLP, Pressman Ciocca Smith LLP, Rooney,
     Ida, Nolt & Ahern, KPMG  LLP, Arthur Andersen LLP, Bill Mitts, Inc.,
     Gollob, Morgan, Peddy & Co., P.C. and Ernst & Young LLP which meets the
     requirements of subsections (a) and (b), respectively, of this Section,
     except that the specified date referred to in such subsections will be a
     date not more than five days prior to such Closing Date for the purposes of
     this subsection.

          (k) The Securities to be delivered on such Closing Date shall have
     been approved for listing on NYSE, subject, in the case of Offered
     Securities being sold by the Company, only to official notice of issuance.

                                       15

 
The Selling Stockholders and the Company will furnish the Representatives with
such conformed copies of such opinions, certificates, letters and documents as
the Representatives reasonably request. CSFBC may in its sole discretion waive
on behalf of the Underwriters compliance with any conditions to the obligations
of the Underwriters hereunder, whether in respect of an Optional Closing Date or
otherwise.

          7.  Indemnification and Contribution.  (a)  The Company will indemnify
and hold harmless each Underwriter against any losses, claims, damages or
liabilities, joint or several, to which such Underwriter may become subject,
under the Act or otherwise, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon any
untrue statement or alleged untrue statement of any material fact contained in
any Registration Statement, the Prospectus, or any amendment or supplement
thereto, or any related preliminary prospectus, or arise out of or are based
upon the omission or alleged omission to state therein a material fact required
to be stated therein or necessary to make the statements therein not misleading,
and will reimburse each Underwriter for any legal or other expenses reasonably
incurred by such Underwriter in connection with investigating or defending any
such loss, claim, damage, liability or action as such expenses are incurred;
provided, however, that the Company will not be liable in any such case to the
extent that any such loss, claim, damage or liability arises out of or is based
upon an untrue statement or alleged untrue statement in or omission or alleged
omission from any of such documents in reliance upon and in conformity with
written information furnished to the Company by any Underwriter through the
Representatives specifically for use therein. The foregoing indemnity agreement
with respect to any untrue statement or omission in the Preliminary Prospectus
shall not inure to the benefit of any Underwriter from whom the person asserting
any such losses, claims, damages or liabilities purchased the Offered Securities
if a copy of the Prospectus (as then amended or supplemented if the Company
shall have furnished any amendments or supplements thereto) was not sent or
given by or on behalf of such Underwriter to such person at or prior to the
written confirmation of the sale of the Offered Securities to such person, and
the Prospectus (as amended or supplemented) would have cured the defect giving
rise to such losses, claims, damages or liabilities.

          (b) Each Selling Stockholder, severally and not jointly, will
indemnify and hold harmless each Underwriter against any losses, claims, damages
or liabilities to which such Underwriter may become subject, under the Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect thereof) arise out of or are based upon any untrue statement or alleged
untrue statement of any material fact contained in any Registration Statement,
the Prospectus, or any amendment or supplement thereto, or any related
preliminary prospectus, or arise out of or are based upon the omission or
alleged omission to state therein a material fact required to be stated therein
or necessary to make the statements therein not misleading, and will reimburse
each Underwriter for any legal or other expenses reasonably incurred by such
Underwriter in connection with investigating or defending any such loss, claim,
damage, liability or action as such expenses are incurred; provided, however,
that the Selling Stockholders will not be liable in any such case to the extent
that any such loss, claim, damage or liability arises out of or is based upon an
untrue statement or alleged untrue statement in or omission or alleged omission
from any of such documents in reliance upon and in conformity with written
information furnished to the Company by an Underwriter through the
Representatives specifically for use therein; provided, further, that a Selling
Stockholder shall only be subject to such liability to the extent that the
untrue statement or alleged untrue statement or omission or alleged omission was
made in reliance upon and in conformity with written information furnished to
the Company by such Selling Stockholder specifically for use therein. The
foregoing indemnity agreement with respect to any untrue statement or omission
in the Preliminary Prospectus shall not inure to the benefit of any Underwriter
from whom the person asserting any such losses, claims, damages or liabilities
purchased the Offered Securities if a copy of the Prospectus (as then amended or
supplemented if the Company shall have furnished any amendments or supplements
thereto) was not sent or given by or on behalf of such Underwriter to such
person at or prior to the written confirmation of the sale of the Offered
Securities to such person, and the Prospectus (as amended or supplemented) would
have cured the defect giving rise to such losses, claims, damages or
liabilities.  In no event, however, shall the 

                                       16

 
liability of any Selling Stockholder for indemnification under this Section 7(b)
exceed the lesser of (i) the proceeds received by such Selling Stockholder from
the Underwriters in the Offering and (ii) that portion of the total losses,
claims, damages and liabilities for which the Underwriters and any controlling
persons may be subject to indemnification hereunder equal to the ratio of the
total number of Offered Securities sold hereunder by such Selling Stockholder as
compared to the total Offered Securities sold hereunder by all Selling
Stockholders.

          (c) Each Underwriter will severally and not jointly indemnify and hold
harmless the Company and each Selling Stockholder against any losses, claims,
damages or liabilities to which the Company or such Selling Stockholder may
become subject, under the Act or otherwise, insofar as such losses, claims,
damages or liabilities (or actions in respect thereof) arise out of or are based
upon any untrue statement or alleged untrue statement of any material fact
contained in any Registration Statement, the Prospectus, or any amendment or
supplement thereto, or any related preliminary prospectus, or arise out of or
are based upon the omission or the alleged omission to state therein a material
fact required to be stated therein or necessary to make the statements therein
not misleading, in each case to the extent, but only to the extent, that such
untrue statement or alleged untrue statement or omission or alleged omission was
made in reliance upon and in conformity with written information furnished to
the Company by such Underwriter through the Representatives specifically for use
therein, and will reimburse any legal or other expenses reasonably incurred by
the Company and each Selling Stockholder in connection with investigating or
defending any such loss, claim, damage, liability or action as such expenses are
incurred.

          (d) Promptly after receipt by an indemnified party under this Section
or Section 9 of notice of the commencement of any action, such indemnified party
will, if a claim in respect thereof is to be made against an indemnifying party
under subsection (a), (b) or (c) above notify the indemnifying party of the
commencement thereof; but the omission so to notify the indemnifying party will
not relieve it from any liability which it may have to any indemnified party
otherwise than under subsection (a), (b) or (c) above.  In case any such action
is brought against any indemnified party and it notifies an indemnifying party
of the commencement thereof, the indemnifying party will be entitled to
participate therein and, to the extent that it may wish, jointly with any other
indemnifying party similarly notified, to assume the defense thereof, with
counsel satisfactory to such indemnified party (who shall not, except with the
consent of the indemnified party, be counsel to the indemnifying party), and
after notice from the indemnifying party to such indemnified party of its
election so to assume the defense thereof, the indemnifying party will not be
liable to such indemnified party under this Section as the case may be, for any
legal or other expenses subsequently incurred by such indemnified party in
connection with the defense thereof other than reasonable costs of
investigation.  No indemnifying party shall, without the prior written consent
of the indemnified party, effect any settlement of any pending or threatened
action in respect of which any indemnified party is or could have been a party
and indemnity could have been sought hereunder by such indemnified party unless
such settlement includes an unconditional release of such indemnified party from
all liability on any claims that are the subject matter of such action.


          (e) If the indemnification provided for in this Section  is
unavailable or insufficient to hold harmless an indemnified party under
subsection (a), (b) or (c) above, then each indemnifying party shall contribute
to the amount paid or payable by such indemnified party as a result of the
losses, claims, damages or liabilities referred to in subsection (a), (b) or (c)
above (i) in such proportion as is appropriate to reflect the relative benefits
received by the Company, the Selling Stockholders and the Underwriters from the
offering of the Offered Securities or (ii) if the allocation provided by clause
(i) above is not permitted by applicable law, in such proportion as is
appropriate to reflect not only the relative benefits referred to in clause (i)
above but also the relative fault of the Company, the Selling Stockholders and
the Underwriters in connection with the statements or omissions which resulted
in such losses, claims, damages or liabilities as well as any other relevant
equitable considerations.  The relative benefits received by the Company, the
Selling Stockholders and the Underwriters shall be deemed to be in the same
proportion as the total net 

                                       17

 
proceeds from the offering (before deducting expenses) received by the Company
and each Selling Stockholder bear to the total underwriting discounts and
commissions received by the Underwriters. The relative fault shall be determined
by reference to, among other things, whether the untrue or alleged untrue
statement of a material fact or the omission or alleged omission to state a
material fact relates to information supplied by the Company, the Selling
Stockholders or the Underwriters and the parties' relative intent, knowledge,
access to information and opportunity to correct or prevent such untrue
statement or omission. The amount paid by an indemnified party as a result of
the losses, claims, damages or liabilities referred to in the first sentence of
this subsection (e) shall be deemed to include any legal or other expenses
reasonably incurred by such indemnified party in connection with investigating
or defending any action or claim which is the subject of this subsection (e).
Notwithstanding the provisions of this subsection (e), no Underwriter shall be
required to contribute any amount in excess of the amount by which the total
price at which the Securities underwritten by it and distributed to the public
were offered to the public exceeds the amount of any damages which such
Underwriter has otherwise been required to pay by reason of such untrue or
alleged untrue statement or omission or alleged omission and no Selling
Stockholder shall be required to contribute any amount in excess of the amount
of the proceeds received by such Selling Stockholder from the Underwriters in
the Offering. No person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Act) shall be entitled to contribution from any
person who was not guilty of such fraudulent misrepresentation. The
Underwriters' and the Selling Stockholders' obligations in this subsection (e)
to contribute are several in proportion to their respective obligations and not
joint.

          (f) The obligations of the Company and the Selling Stockholders under
this Section shall be in addition to any liability which the Company and the
Selling Stockholders may otherwise have and shall extend, upon the same terms
and conditions, to each person, if any, who controls any Underwriter within the
meaning of the Act; and the obligations of the Underwriters under this Section
shall be in addition to any liability which the respective Underwriters may
otherwise have and shall extend, upon the same terms and conditions, to each
director of the Company, to each officer of the Company who has signed a
Registration Statement and to each person, if any, who controls the Company
within the meaning of the Act.

          8.  Default of Underwriters.  If any Underwriter or Underwriters
default in their obligations to purchase Offered Securities hereunder on either
the First or any Optional Closing Date and the aggregate number of shares of
Offered Securities that such defaulting Underwriter or Underwriters agreed but
failed to purchase does not exceed 10% of the total number of shares of Offered
Securities that the Underwriters are obligated to purchase on such Closing Date,
CSFBC may make arrangements satisfactory to the Company and the Selling
Stockholders for the purchase of such Offered Securities by other persons,
including any of the Underwriters, but if no such arrangements are made by such
Closing Date, the non-defaulting Underwriters shall be obligated severally, in
proportion to their respective commitments hereunder, to purchase the Offered
Securities that such defaulting Underwriter or Underwriters agreed but failed to
purchase on such Closing Date.  If any Underwriter or Underwriters so default
and the aggregate number of shares of Offered Securities with respect to which
such default or defaults occur exceeds 10% of the total number of shares of the
Offered Securities that the Underwriters are obligated to purchase on such
Closing Date and arrangements satisfactory to CSFBC, the Company and the Selling
Stockholders for the purchase of such Offered Securities by other persons are
not made within 36 hours after such default, this Agreement will terminate
without liability on the part of any non-defaulting Underwriter, the Company or
the Selling Stockholders, except as provided in Section 9 (provided that if such
default occurs with respect to Optional Securities after the First Closing Date,
this Agreement will not terminate as to the Firm Securities or any Optional
Securities purchased prior to such termination).  As used in this Agreement, the
term "Underwriter" includes any person substituted for an Underwriter under this
Section.  Nothing herein will relieve a defaulting Underwriter from liability
for its default.

          9. Survival of Certain Representations and Obligations.  The
respective indemnities, agreements, representations, warranties and other
statements of the Selling Stockholders, of the Company or its officers and of
the several Underwriters set forth in or made pursuant to this Agreement will
remain

                                       18

 
in full force and effect, regardless of any investigation, or statement
as to the results thereof, made by or on behalf of any Underwriter, any Selling
Stockholder and the Company or any of their respective representatives, officers
or directors or any controlling person, and will survive delivery of and payment
for the Offered Securities.  If this Agreement is terminated pursuant to Section
8 or if for any reason the purchase of the Offered Securities by the
Underwriters is not consummated, the Company and the Selling Stockholders shall
remain responsible for the expenses to be paid or reimbursed by them pursuant to
Section 5 the respective obligations of the Company, the Selling Stockholders,
and the Underwriters pursuant to Section 7 shall remain in effect, and if any
Offered Securities have been purchased hereunder the representations and
warranties in Section 2 and all obligations under Section 5 shall also remain in
effect.  If the purchase of the Offered Securities by the Underwriters is not
consummated for any reason other than solely because of the termination of this
Agreement pursuant to Section 8 or the occurrence of any event specified in
clause (iii), (iv) or (v) of Section 6(d), the Company will reimburse the
Underwriters for all out-of-pocket expenses (including fees and disbursements of
counsel) reasonably incurred by them in connection with the offering of the
Offered Securities.

          10.  Notices.  All communications hereunder will be in writing and, if
sent to the Underwriters, will be mailed, delivered or telegraphed and confirmed
to the Representatives, c/o Credit Suisse First Boston Corporation, Eleven
Madison Avenue, New York, N.Y. 10010-3629, Attention:  Investment Banking
Department--Transactions Advisory Group; if sent to the Company, will be mailed,
delivered or telegraphed and confirmed to it at 116 Huntington Avenue, Boston,
MA 02116, Attention:  Steven B. Dodge or, if sent to the Selling Stockholders or
any of them, will be mailed, delivered or telegraphed and confirmed c/o with
respect to Selling Stockholders listed on Schedule A, Steven B. Dodge  at 116
Huntington Avenue, Boston, MA, 02116, provided, however, that any notice to an
Underwriter pursuant to Section 7 will be mailed, delivered or telegraphed and
confirmed to such Underwriter.

          11.  Successors.  This Agreement will inure to the benefit of and be
binding upon the parties hereto and their respective personal representatives
and successors and the officers and directors and controlling persons referred
to in Section 7, and no other person will have any right or obligation
hereunder.

          12.  Representation.  The Representatives will act for the several
Underwriters in connection with the transactions contemplated by this Agreement,
and any action under this Agreement taken by the Representatives jointly or by
CSFBC will be binding upon all the Underwriters.  Steven B. Dodge or Joseph L.
Winn as attorneys-in-fact, will act for the Selling Stockholders, in connection
with such transactions, and any action under or in respect of this Agreement
taken by any of them will be binding upon all the Selling Stockholders.

          13.  Counterparts.  This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original, but all such
counterparts shall together constitute one and the same Agreement.

          14.  Applicable Law.  This Agreement shall be governed by, and
construed in accordance with, the laws of the State of New York, without regard
to principles of conflicts of laws.

          The Company hereby submits to the non-exclusive jurisdiction of the
Federal and state courts in the Borough of Manhattan in The City of New York in
any suit or proceeding arising out of or relating to this Agreement or the
transactions contemplated hereby.

                                       19

 
          If the foregoing is in accordance with the Representatives'
understanding of our agreement, kindly sign and return to us three of the
counterparts hereof, whereupon it will become a binding agreement among the
Company, the Selling Stockholders and the several Underwriters in accordance
with its terms.

                         Very truly yours,

                         American Tower Corporation


                         By:  ____________________________________
                              Name: Steven B. Dodge
                              Title:   President and Chief Executive Officer


                         Each of The Selling Stockholders Listed on 
                         Schedule A Hereto


                         By:  ____________________________________
                                 Attorney-in-fact


The foregoing Underwriting Agreement
 is hereby confirmed and accepted
 as of the date first above written.

     Credit Suisse First Boston Corporation,
     BT Alex. Brown Incorporated,
     Lehman Brothers Inc.,
     Morgan Stanley & Co. Incorporated,
     Salomon Smith Barney Inc.,
     Bear, Stearns & Co. Inc.,
     Merrill Lynch, Pierce, Fenner & Smith
             Incorporated, and
     NationsBanc Montgomery Securities LLC

          Acting on behalf of themselves and as
           the Representatives of the several
           Underwriters.

     By  Credit Suisse First Boston Corporation


     By:  ________________________   
          Name: Kristin Allen
          Title:   Managing Director

                                       20

 
                            SCHEDULE A



 
                                                                 Number of
                                                              Firm Securities
Selling Stockholder                                             to be Sold
- -------------------                                           ---------------   
 
Mr. and Mrs. Alan L. Box (Class A Common Stock)                       150,000

Chase Equity Associates, L.P.
          (Class A Common Stock)                                        3,461
          (Class C Common Stock)                                      386,136

Chase Manhattan Capital L.P.
          (Class A Common Stock)                                      610,403

Summit Capital Inc. (Class A Common Stock)                            150,000
                                                                    ---------

     Total...............................................           1,300,000
                                                                    =========

                                       21

 
                            SCHEDULE B


 
                                 
                                                   Number of Firm
                                                     Securities
                                                       to be
           Underwriter                               Purchased
           -----------                             --------------
 
Credit Suisse First Boston Corporation..........
 
BT Alex. Brown Incorporated.....................
 
Lehman Brothers Inc.............................
 
Morgan Stanley & Co. Incorporated...............
 
Salomon Smith Barney Inc........................
 
Bear, Stearns & Co. Inc. .......................
 
Merrill Lynch, Pierce, Fenner & Smith
   Incorporated.................................

NationsBanc Montgomery Securities LLC...........
 
     Total......................................    19,300,000
                                                    ==========

                                       22

 
                                    ANNEX I


American Towers, Inc.
ATC Merger Corporation
ATC Holding, Inc.
ATC Operating Inc.
ATC GP Inc.
ATC LP, Inc.
American Tower, L.P.

                                       23

 
                                                                       Exhibit 5
 
                                                                February 3, 1999
 
American Tower Corporation
116 Huntington Avenue
Boston, Massachusetts 02116
 
Ladies and Gentlemen:
 
  In connection with the registration under the Securities Act of 1933, as
amended (the "Securities Act"), by American Tower Corporation, a Delaware
Corporation ("American Tower"), of 21,230,000 shares (the "Shares") of its
Class A Common Stock, par value $.01 per share (the "Class A Common Stock"),
19,930,000 of which Shares (including those of which may be issued pursuant to
the over-allotment option contained in the Registration Statement hereinafter
referred to) are to be offered by American Tower and 1,300,000 of which Shares
are to be offered by the Selling Stockholders (described in the Registration
Statement), the following opinion is furnished to you to be filed with the
Securities and Exchange Commission (the "Commission") as Exhibit 5 to American
Tower's registration statement on Form S-1 (the "Registration Statement").
 
  We have acted as counsel to American Tower in connection with the preparation
of the Registration Statement, and we have examined originals or copies,
certified or otherwise identified to our satisfaction, of the Registration
Statement, corporate records, certificates and statements of officers and
accountants of American Tower, and of public officials, and such other
documents as we have considered relevant and necessary in order to furnish the
opinion hereinafter set forth. We express no opinion herein as to any laws
other than the General Corporation Law of the State of Delaware.
 
  The authorized capital stock of American Tower consists of 20,000,000 shares
of preferred stock, par value $.01 per share (the "Preferred Stock"), the
relative designations, preferences, rights and restrictions of which are to be
designated from time to time by the Board of Directors of American Tower,
200,000,000 shares of Class A Common Stock, 50,000,000 shares of Class B Common
Stock, par value $.01 per share, and 10,000,000 shares of Class C Common Stock,
par value $.01 per share (collectively, the "Common Stock").
 
  Based on and subject to the foregoing, we are of the opinion that: (a) the
Shares have been duly and validly authorized by American Tower; (b) with
respect to the Shares to be offered by the Selling Stockholders, all necessary
actions on the part of American Tower in connection with the issuance of said
Shares have been taken and said Shares are validly issued, fully paid and non-
assessable; and (c) with respect to the Shares to be offered by American Tower,
all necessary actions on the part of American Tower in connection therewith
have been taken and, upon delivery to the underwriters against payment therefor
in accordance with the terms of the Underwriting Agreement to be entered into
among American Tower, the Selling Stockholders, Credit Suisse First Boston
Corporation, BT Alex. Brown Incorporated, Lehman Brothers Inc., Morgan Stanley
& Co. Incorporated, Salomon Smith Barney Inc., Bear, Stearns & Co. Inc.,
Merrill Lynch, Pierce, Fenner & Smith Incorporated, and NationsBanc Montgomery
Securities LLC, said Shares will be validly issued, fully paid and non-
assessable.
 
  We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the reference to our firm therein under the
caption "Validity of the Shares." In giving such consent, we do not thereby
admit that we come within the category of persons whose consent is required
under Section 7 of the Securities Act or under the Rules and Regulations of the
Commission promulgated thereunder.
 
                                          Very truly yours,
 
                                          /s/ Sullivan & Worcester LLP
                                          Sullivan & Worcester LLP

 
                                                                    EXHIBIT 23.6
 
                          CONSENT OF BILL MITTS, INC.
   
I consent to the reference to our firm under the caption "Experts" in the
Registration Statement on Form S-1 of American Tower Corporation and to the
inclusion therein of our report dated May 8, 1997 with respect to the
statements of earnings, changes in stockholders' equity and cash flows of Novak
& Lackey Construction Co., Inc. as of June 30, 1996.     
 
                                          /s/ Bill Mitts, Inc.
 
Oklahoma City, Oklahoma
January 19, 1999