SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT


                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


  Date of Report (Date of earliest event reported) June 10, 1998 (May 12, 1998)



                           AMERICAN TOWER CORPORATION
             (Exact name of registrant as specified in its Charter)

         Delaware                   001-14195                   65-0723837
(State or other jurisdiction       (Commission                 (IRS Employer
    of incorporation)              File Number)              Identification No.)

                 116 Huntington Avenue
                 Boston, Massachusetts                    02116
         (Address of principal executive offices)      (Zip Code)

                                 (617) 375-7500
              (Registrant's telephone number, including area code)

                       American Tower Systems Corporation
          (Former name or former address, if changed since last report)










Item 2.  Acquisition or Disposition of Assets.

On June 8, 1998,  American Tower  Corporation  (formerly  American Tower Systems
Corporation,  the "Company")  consummated the  transactions  contemplated by the
Agreement and Plan of Merger (the "Merger  Agreement")  by and between  American
Tower  Systems  Corporation,   a  Delaware   Corporation,   and  American  Tower
Corporation ("ATC"), a Delaware Corporation,  dated as of December 12, 1997, and
as amended as of June 5, 1998,  whereby ATC was merged (the  "Merger")  with and
into  the  Company.  Pursuant  to  the  Merger  Agreement,  the  Company  issued
30,034,750  shares  of Class A  Common  Stock  (including  options  to  purchase
1,252,364 shares) and borrowed  approximately  $57.0 million under the Company's
credit agreement.  The Company paid off approximately  $118.3 million of assumed
debt and $4.5 million of redeemable  preferred  stock assumed in connection with
the Merger.  Upon consummation of the Merger,  the Company changed its name from
American Tower Systems Corporation to American Tower Corporation.

Immediately  following the Merger,  Fred R. Lummis,  the Chief Executive Officer
and  President  of ATC, and Randall  Mays,  the Chief  Financial  Officer and an
Executive Vice President of Clear Channel  Communications,  Inc. were elected to
the Board of Directors of the Company and Joseph L. Winn,  the  Company's  Chief
Financial Officer and Treasurer, resigned as a director of the Company.

ATC is a leading  independent  owner and  operator  of  wireless  Communications
towers  with  approximately  900  towers  (including  pending   acquisitions  of
approximately  60 towers) in 32 states,  of which  approximately  125 towers are
managed for a third party owner.

See Item 7. below for financial statement and exhibit information.


Item 5. Other Events.

On June 5, 1998,  the Company became listed on the New York Stock Exchange under
the  symbol  "AMT",  as a result of a  distribution  of its shares by its former
parent, American Radio Systems Corporation,  which completed its merger with CBS
Corporation as of June 4, 1998.

On June 4, 1998,  the Company  privately  placed shares of it Series  Redeemable
Pay-In-Kind Preferred Stock, having an initial liquidation  preference of $300.0
million (the "Interim Preferred Stock"), to certain  institutional  investors in
order to finance the Company's obligation to CBS Corporation with respect to the
CBS merger tax  reimbursement.  Proceeds of the public equity offering described
below will be used to redeem the  Interim  Preferred  Stock at a price  equal to
101% of the then  aggregate  liquidation  preference  together  with accrued and
unpaid dividends.






On May 12, 1998, the Company filed with the  Securities and Exchange  Commission
(the  "Commission")  a  registration  statement  relating to the  offering  (the
"Offering")  of an aggregate of 23,619,871  shares of Class A Common  Stock,  of
which 20,000,000 shares are to be sold on behalf of the Company. Proceeds of the
Company's  offering will be used to redeem the Interim  Preferred Stock that was
issued on June 4, 1998, and to reduce bank  borrowings.  The Offering is subject
to various conditions,  including prevailing market conditions. The registration
statement  relating to these  securities  has been filed with the Commission but
has not yet become effective. These securities may not be sold nor may offers to
buy be accepted prior to the time the registration  statement becomes effective.
This communication  shall not constitute an offer to sell or the solicitation of
an offer to buy nor shall there be any sale of these  securities in any state in
which such offer,  solicitation  or sale would be unlawful prior to registration
or  qualification  under the  securities  laws of any such state.  Copies of the
Prospectus  relating to the  Offering may be obtained  from Credit  Suisse First
Boston,  Prospectus  Department,  11 Madison  Avenue,  New York, New York 10010,
(212) 325-2000.


On May 21, 1998 American Tower Systems (Delaware),  Inc. ("ATSI"),  a subsidiary
of the Company  consummated the Asset Purchase Agreement dated as of January 23,
1998, by and among ATSI, Midcontinent Media, Inc. a South Dakota corporation and
a wholly-owned  subsidiary of Midcontinent  ("MTC"), Wit Communications,  Inc. a
Delaware  Corporation and wholly-owned  subsidiary of MTC ("WIT") and Washington
International  Teleport, Inc. a Delaware Corporation and wholly-owned subsidiary
of WIT, pursuant to which ATSI acquired  substantially all the assets of WIT for
an aggregate  purchase  price of $30.5  million.  The  acquisition  was financed
through borrowings under the Company's credit agreement.

WIT  is a  local  provider  of  video  transport  operations,  transmitting  and
receiving voice, video and data by satellite and terrestrial networks.


Item 7.  Financial Statements and Exhibits.

(a)   Financial Statements of business acquired.

Pursuant to Regulation 240.15d-11,  the Company met the Form 8-K requirements to
provide financial statements for the periods specified in Regulation 210.3.05 in
the Company's  Amendment No. 1 to Registration  Statement No.  333-52481 on Form
S-1 as filed on June 1, 1998.  The financial  statements of ATC were provided as
follows:

         Independent Auditors' Report
         Consolidated Balance Sheets as December 31, 1996 and 1997 and March 31,
         1998 (unaudited)
         Consolidated  Statements of Operations for the years ended December 31,
         1995,  1996 and 1997 and three  months  ended  March 31,  1997 and 1998
         (unaudited)
         Consolidated  Statements  of  Stockholders'  Equity for the years ended
         December 31, 1995,  1996 and 1997 and three months ended March 31, 1998
         (unaudited)
         Consolidated  Statements of Cash Flows for the years ended December 31,
         1995,  1996 and 1997 and three  months  ended  March 31,  1997 and 1998
         (unaudited)
         Notes to Consolidated Financial Statements




         (b)  Unaudited Pro Forma Financial Information.

         Pursuant  to  Regulation  240.15d-11,  the  Company  met the  Form  8-K
         requirements to provide pro forma financial  statements for the periods
         specified in Regulation  210.11.02 and 11.03 in the Company's Amendment
         No. 1 to Registration  Statement No. 333- 52481 on Form S-1 as filed on
         June 1, 1998. The following unaudited pro forma condensed  consolidated
         financial statements were provided in the filing:

         Unaudited Pro Forma Condensed  Consolidated Balance Sheet for the three
         months ended March 31, 1998 
         Unaudited Pro Forma Condensed Consolidated Statements of Operations for
         the three months ended March 31, 1998 and year ended  December 31, 1998
         Notes  to  Unaudited  Pro  Forma   Condensed   Consolidated   Financial
         Statements

         (c)  Exhibits.

         Exhibit 2.1 - First Amendment to Agreement and Plan of Merger, dated as
         of  June  5,  1998,  by  and  among  the  Company  and  American  Tower
         Corporation. (Exhibits omitted)

         Exhibit 2.2 - Agreement  and Plan of Merger,  dated as of December  12,
         1997, by and among the Company and American Tower Corporation.*

         * Filed as Exhibit 2.3 to the Company's  Registration Statement on Form
         S-4 filed on February 10, 1998 (File No. 333-46025).





                                   SIGNATURES


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  Registrant  has duly  caused  this  report  to be  signed  on behalf of the
undersigned hereunto duly authorized.


                               AMERICAN TOWER CORPORATION
                               (Registrant)

Date:    June 10, 1998         By: /s/ Justin D. Benincasa
                                  Name: Justin D. Benincasa
                                  Title: Vice President and Corporate Controller
                 FIRST AMENDMENT TO AGREEMENT AND PLAN OF MERGER


         First  Amendment  (the  "Amendment"),  dated as of June 5, 1998, by and
between American Tower Systems Corporation,  a Delaware corporation ("ATS"), and
American Tower Corporation, a Delaware corporation ("ATC"), to the Agreement and
Plan of Merger,  dated as of December 12, 1997,  by and between ATS and ATC (the
"Original Agreement").

                              W I T N E S S E T H:

         WHEREAS,  ATC and ATS  have  determined  that  the  Original  Agreement
providing  for the  merger  (the  "Merger")  of ATC  into ATS on the  terms  and
conditions  set forth in the  Original  Agreement  should be  amended in certain
respects as provided in this Amendment;

         NOW,   THEREFORE,   in   consideration   of  the   premises   and   the
representations, warranties, covenants and agreements herein contained and other
valuable   consideration,   the   receipt  and   adequacy   whereof  are  hereby
acknowledged,  the  parties  hereto  hereby,  intending  to  be  legally  bound,
represent, warrant, covenant and agree as follows:


                                    ARTICLE 1

                                  DEFINED TERMS

         As used  herein,  unless  the  context  otherwise  requires,  the terms
defined in the Original Agreement  (including Appendix A thereto) shall have the
respective meanings set forth therein.  Terms defined in the singular shall have
a comparable  meaning when used in the plural, and vice versa, and the reference
to any gender shall be deemed to include all genders.  Unless otherwise  defined
or the context otherwise clearly requires, terms for which meanings are provided
in this Amendment shall have such meanings when used in each Collateral Document
executed pursuant hereto or otherwise  delivered pursuant hereto.  References to
"hereof,"  "herein" or similar terms are intended to refer to the Agreement as a
whole and not a particular  section,  and  references to "this Section" or "this
Article"  are  intended  to refer to the entire  section  or  article  and not a
particular subsection thereof.


                                    ARTICLE 2

                      AMENDMENTS OF THE ORIGINAL AGREEMENT

         2.1  Amendment  of Section  2.2.  Section 2.2 is amended to read in its
entirety as follows:

                  Closing.  Unless  this  Agreement  shall have been  terminated
         pursuant  to Section  8.1 and  subject to the  satisfaction  or, to the
         extent  permitted by Applicable Law, waiver of the conditions set forth
         in Article  7, the  closing of the  Merger  (the  "Closing")  will take
         place,  at the  offices of Sullivan &  Worcester  LLP,  One Post Office
         Square,  Boston,  Massachusetts  02109,  at 10:00  a.m.,  on the second
         business day after the date the Tower Separation occurs, unless another
         date, time or place is agreed to in writing by the parties. The date on
         which the Closing occurs is herein referred to as the "Closing Date."


                                                      






         2.2  Amendment  of Section  2.5.  Section 2.5 is amended to read in its
entirety as follows:

                  Certificate of  Incorporation.  Subject to the consummation of
         the Merger,  ATS shall file with the Secretary of State of the State of
         Delaware an Amended and Restated  Certificate of Incorporation,  in the
         form  attached  hereto as  Exhibit A and made a part  hereof  (the "ATS
         Restated   Certificate")   and  which  shall  be  the   Certificate  of
         Incorporation of the Surviving  Corporation until thereafter changed or
         amended as provided therein or by Applicable Law.

         2.3  Amendment  of  Section  3.2.  Section  3.2 is  amended  to add the
following at the end thereof:

                  In  the  event  any  ATC   stockholder  has  not  delivered  a
         certificate of non-foreign  status of such  stockholder  that meets the
         requirement of Section 1445 of the Code and Section  1.1445-2(b) of the
         Treasury  Regulations  thereunder,  the Surviving  Corporation shall be
         entitled to withhold  from  delivery cash (in the case of any holder of
         ATC Preferred  Stock) or certificates  for the ATS Class A Common Stock
         (in  the  case  of any  holder  of ATC  Common  Stock)  to  which  such
         stockholder  would  otherwise  be  entitled  to the extent  required to
         enable  the  Surviving   Corporation  to  comply  with  the  applicable
         provisions of the Code.

         2.4 Amendment of Appendix A. Appendix A is amended as follows:

                  (a) To add the  following  definitions  in  their  appropriate
         alphabetical order:

                  Acme  Merger  shall mean the merger of Acme  Towers,  Inc.,  a
         Florida corporation ("Acme"), with and into ATSI,  substantially on the
         terms set forth in the draft Agreement and Plan of Merger, by and among
         ATS,  ATSI,  Acme and its  stockholders,  previously  furnished  to ATC
         (which ATS  represents is the latest draft of such  agreement),  as the
         same has  heretofore  been  amended  or as it may from  time to time be
         hereafter amended, modified, supplemented and restated in a manner that
         does not (i) result in the  issuance of any  additional  Common  Stock,
         Convertible Securities or Option Securities or (ii) increase materially
         the  obligations  and  liabilities  of ATS  (as so  amended,  modified,
         supplemented and restated, the "Acme Merger Agreement").

                  ARS Senior Note Indentures means the indentures, as heretofore
         supplemented and amended,  pursuant to which the 9% Senior Subordinated
         Notes due 2006 of ARS and the 9 3/4% Senior Subordinated Notes due 2005
         of ARS are presently outstanding.

                  ATSLP shall mean  American  Tower  Systems,  L.P.,  a Delaware
         limited  partnership which is indirectly  wholly-owned by ATS and which
         conducts directly or through Subsidiaries  substantially all of the ATS
         Business and owns directly or through Subsidiaries substantially all of
         the ATS  Assets,  other than the ATS  Business  conducted,  and the ATS
         Assets owned, by ATSI.

                  Excluded  ATS Common Stock shall mean the shares of ATS Common
         Stock issued  pursuant to the  consummation  of the Acme Merger and the
         Intracoastal Merger.

                  Intracoastal  Merger  shall  mean the  merger of  Intracoastal
         Broadcasting,  Inc., a Delaware corporation ("Intracoastal"),  with and
         into ATSI,  on the terms set forth in the Agreement and Plan of Merger,
         dated as of April 14, 1998, by and among ATS,  ATSI,  Intracoastal  and
         its  stockholders,  as the  same  may  from  time to time be  hereafter
         amended, modified,  supplemented and restated in a manner that does not
         (i) result in the issuance of any Common Stock,  Convertible Securities
         or Option  Securities in excess of 720,000 shares of ATS Class A common
         Stock  (as  presently  constituted)  or (ii)  increase  materially  the
         obligations   and   liabilities  of  ATS  (as  so  amended,   modified,
         supplemented and restated, the "Intracoastal Merger Agreement").

                                       -2-






                  PIK  Preferred  Stock  shall  mean  (i) up to  $400.0  million
         liquidation  preference  of Series A Redeemable  Pay-In-Kind  Preferred
         Stock (the "Series A Preferred")  referred to in the letter  agreement,
         dated May 20, 1998,  between Credit Suisse First Boston Corporation and
         ATS, and (ii) 11-year Senior Exchangeable  Pay-In-Kind  Preferred Stock
         issued in  exchange  for the  Series A  Preferred,  (the  "Exchangeable
         Preferred  Stock"),  and (iii) any Series A Preferred  or  Exchangeable
         Preferred Stock issued pursuant to the pay-in-kind provisions thereof.

                  Subsequent  Permitted  Acquisitions shall mean the Acme Merger
         and the Intracoastal Merger.

                  (b) To  amend  the  following  definitions  to read  in  their
         respective entirety as follows:

                           ATSI shall  mean  American  Tower  Systems,  Inc.,  a
                  Delaware  corporation  which is  wholly-owned by ATS and which
                  conducts   directly   or   through   Subsidiaries   or   ATSLP
                  substantially  all of the ATS  Business  and owns  directly or
                  through  Subsidiaries  or ATSLP  substantially  all of the ATS
                  Assets.

                           Fully-Diluted  Basis shall mean,  when applied to the
                  ATC Common Stock or the ATS Common Stock,  the total number of
                  shares of the issuer of such stock that are  outstanding as of
                  the date of determination plus, without duplication, the total
                  number  of  all  shares  issuable  in  respect  of  securities
                  convertible  into or exchangeable  for ATC Common Stock or ATS
                  Common Stock  (excluding  the Excluded ATS Common  Stock,  but
                  including  ATC Common  Stock or ATS  Common  Stock that may be
                  issued  upon  conversion  of  Convertible  Securities  or  the
                  exercise  of  Option   Securities).   Without   limiting   the
                  foregoing,  the parties  agree that,  if the Tower  Separation
                  occurs before the CBS Merger, the term  "Fully-Diluted  Basis"
                  would take into account any  Convertible  Securities or Option
                  Securities  that  ATS  or  the  Surviving  Corporation  may be
                  required to issue upon consummation of the CBS Merger.

                           Option Securities shall mean all rights,  options and
                  warrants,  and calls or commitments  evidencing the right,  to
                  subscribe for, purchase or otherwise acquire shares of capital
                  stock or Convertible  Securities,  and all stock  appreciation
                  rights,  in each case  whether  or not the right to  subscribe
                  for, purchase or otherwise acquire is immediately  exercisable
                  or is conditioned  upon the passage of time, the occurrence or
                  non-occurrence or the existence or non-existence of some other
                  Event.

                           Termination  Date  shall  mean  June 8,  1998 or such
                  other date as the  parties  may,  from time to time,  mutually
                  agree.

         2.5  Amendment  of  Exhibits.  Exhibits  B-1  and  B-2 of the  Original
Agreement are deleted in their entirety and Exhibit A attached hereto and made a
part hereof is substituted as Exhibit B of the Original Agreement.

         2.6      Amendment of ATS Disclosure Schedule.

                  (a) Section 5.23(c) of the ATS Disclosure  Schedule is amended
         to add to the  description  of consents that will be required (and that
         ATS  represents  have been  obtained) in order to consummate  the Tower
         Separation the consent of the holders of a majority in principal amount
         of (i) the 9% Senior  Subordinated Notes due 2006 of ARS and (ii) the 9
         3/4% Senior  Subordinated  Notes due 2005 of ARS issuable under the ARS
         Senior Note Indentures; and


                                       -3-






                  (b) Section 6.6(l) of the ATS  Disclosure  Schedule is amended
         to read in its  entirety as set forth in Exhibit B attached  hereto and
         made a part hereof.


                                    ARTICLE 3

                      REPRESENTATIONS AND WARRANTIES OF ATC

         ATC  hereby  represents  and  warrants  to ATS  as  follows  (it  being
understood  and agreed by the  parties  that,  except as the  context  otherwise
requires,  the  representations  and warranties of ATC set forth in this Article
shall apply to each of its Subsidiaries with the same force and effect as though
each of them were named in each Section hereof):

         3.1      Power and Authority; Authorization; Effect of Transaction.

                  (a) ATC has all requisite  power and authority  (corporate and
         other) and has in full force and effect all Governmental Authorizations
         and  Private  Authorizations  necessary  to  enable it to  execute  and
         deliver, and to perform its obligations under, this Amendment;  and the
         execution,  delivery and  performance  of this  Amendment has been duly
         authorized  by all  requisite  corporate or other action on the part of
         ATC, and no other  corporate  proceedings on the part of ATC (including
         without  limitation  the  approval  of the  stockholders  of ATC),  are
         necessary to authorize  this  Amendment.  This  Amendment has been duly
         executed and  delivered  by ATC and  constitutes  the legal,  valid and
         binding  obligation of ATC,  enforceable in accordance  with its terms,
         except as such enforceability may be subject to bankruptcy, moratorium,
         insolvency,    reorganization,    arrangement,   voidable   preference,
         fraudulent  conveyance  and other similar laws relating to or affecting
         the  rights of  creditors  and except as the same may be subject to the
         effect of general principles of equity. .

                  (b)  Except  as  set  forth  in  Section  4.1(c)  of  the  ATC
         Disclosure Schedule,  neither the execution and delivery by ATC of this
         Amendment  nor  the  consummation  of  the  Transactions  by  ATC,  nor
         compliance with the terms, conditions and provisions hereof by ATC:

                           (i) will  conflict  with,  or  result  in a breach or
                  violation  of, or  constitute  a default  under,  any  Organic
                  Document of ATC or any Applicable  Law, or will conflict with,
                  or result in a breach or violation of, or constitute a default
                  under,  or  permit  the  acceleration  of  any  obligation  or
                  liability in, or but for any  requirement  of giving of notice
                  or passage of time or both  would  constitute  such a conflict
                  with,  breach or violation of, or default under, or permit any
                  such acceleration in, any Material Agreement of ATC; or

                           (ii)  will   require   ATC  to  make  or  obtain  any
                  Governmental  Authorization,  Governmental  Filing or  Private
                  Authorization  including  without  limitation  under  the FCA,
                  except as required by the Hart-Scott-Rodino Act and other than
                  any of the foregoing that have been obtained.

                  (c) The Original Agreement has been approved and adopted,  and
         the Merger has been approved, by the ATC Required Vote evidenced by the
         written  consent  of the  holders  of not less than a  majority  of the
         issued and  outstanding  shares of ATC  Common  Stock  pursuant  to the
         provisions of Section 228 of the DCL and the Organic  Documents of ATC.
         ATC will promptly after the execution and delivery of such consent mail
         the notice  required  by Section  228 of the DCL to all  holders of ATC
         Common Stock who did not execute such consent.



                                       -4-






                                    ARTICLE 4

                      REPRESENTATIONS AND WARRANTIES OF ATS

         ATS  hereby  represents  and  warrants  to ATC  as  follows  (it  being
understood  and agreed by the  parties  that,  except as the  context  otherwise
requires,  the  representations  and warranties of ATS set forth in this Article
shall apply to each of its  Subsidiaries  (including  the New ATS  Subsidiaries)
with the same force and effect as though each of them were named in each Section
hereof):

         4.1      Power and Authority; Authorization; Effect of Transaction.

                  (a) ATS has all requisite  power and authority  (corporate and
         other) and has in full force and effect all Governmental Authorizations
         and  Private  Authorizations  necessary  to  enable it to  execute  and
         deliver, and to perform its obligations under, this Amendment;  and the
         execution,  delivery and  performance  of this  Amendment has been duly
         authorized  by all  requisite  corporate or other action on the part of
         ATS, and no other  corporate  proceedings on the part of ATS (including
         without  limitation  the  approval  of the  stockholders  of ATS),  are
         necessary to authorize  this  Amendment.  This  Amendment has been duly
         executed and  delivered  by ATS and  constitutes  the legal,  valid and
         binding  obligation of ATS,  enforceable in accordance  with its terms,
         except as such enforceability may be subject to bankruptcy, moratorium,
         insolvency,    reorganization,    arrangement,   voidable   preference,
         fraudulent  conveyance  and other similar laws relating to or affecting
         the  rights of  creditors  and except as the same may be subject to the
         effect of general principles of equity.

                  (b)  Except  as  set  forth  in  Section  5.1(c)  of  the  ATS
         Disclosure Schedule,  neither the execution and delivery by ATS of this
         Amendment  nor  the  consummation  of  the  Transactions  by  ATS,  nor
         compliance with the terms, conditions and provisions hereof by ATS:

                           (i) will  conflict  with,  or  result  in a breach or
                  violation  of, or  constitute  a default  under,  any  Organic
                  Document of ATS or any Applicable  Law, or will conflict with,
                  or result in a breach or violation of, or constitute a default
                  under,  or  permit  the  acceleration  of  any  obligation  or
                  liability in, or but for any  requirement  of giving of notice
                  or passage of time or both  would  constitute  such a conflict
                  with,  breach or violation of, or default under, or permit any
                  such acceleration in, any Material Agreement of ATS; or

                           (ii)  will   require   ATS  to  make  or  obtain  any
                  Governmental  Authorization,  Governmental  Filing or  Private
                  Authorization  including  without  limitation  under  the FCA,
                  except as required by the Hart-Scott-Rodino Act and other than
                  any of the foregoing that have been obtained.

                  (c)  Except  as  set  forth  in  Section  5.1(c)  of  the  ATS
         Disclosure Schedule,  neither the execution and delivery by ATS of this
         Agreement  or  any  Collateral  Document  executed  or  required  to be
         executed by it pursuant hereto or thereto,  nor the consummation of the
         Transactions  by ATS, nor  compliance  with the terms,  conditions  and
         provisions hereof or thereof by ATS:

                           (i) will  conflict  with,  or  result  in a breach or
                  violation  of, or  constitute  a default  under,  any  Organic
                  Document of ATS or any Applicable  Law, or will conflict with,
                  or result in a breach or violation of, or constitute a default
                  under,  or  permit  the  acceleration  of  any  obligation  or
                  liability in, or but for any  requirement  of giving of notice
                  or passage of time or both  would  constitute  such a conflict
                  with,  breach or violation of, or default under, or permit any
                  such acceleration in, any Material Agreement of ATS; or


                                       -5-






                           (ii)  will   require   ATS  to  make  or  obtain  any
                  Governmental  Authorization,  Governmental  Filing or  Private
                  Authorization  including  without  limitation  under  the FCA,
                  except as required by the Hart-Scott-Rodino Act and other than
                  any of the foregoing that have been obtained.

                  (d) Exhibit B hereto sets forth the names and jurisdictions of
         organizations  of  each  Subsidiary  of  ATS,  as of the  date  of this
         Amendment,  which  is not  set  forth  in  Section  5.1(d)  of the  ATS
         Disclosure Schedule (the "New ATS  Subsidiaries").  Each of the New ATS
         Subsidiaries  is  (i)  wholly-owned,  (ii)  an  Entity  which  is  duly
         organized,  validly existing and in good standing under the laws of the
         respective state of organization,  and (iii) duly qualified and in good
         standing  as a  foreign  corporation  or  other  Entity  in each  other
         jurisdiction  in which the character of the property owned or leased by
         it  or  the  nature  of  its  business  or  operations   requires  such
         qualification,  with full power and authority  (corporate and other) to
         carry  on  the  business  in  which  it is  engaged,  except  for  such
         qualifications  the failure of which to obtain,  individually or in the
         aggregate,  would not have a Material  Adverse Effect on ATS. ATS owns,
         directly or indirectly, all of the outstanding capital stock and equity
         interests of each of the New Subsidiaries,  free and clear of all Liens
         (except for Permitted Liens or except as set forth on Section 5.1(d) of
         the ATS  Disclosure  Schedule),  and all such  stock  or  other  equity
         interests has been duly authorized and validly issued and is fully paid
         and  nonassessable.  There  are no  outstanding  Option  Securities  or
         Convertible  Securities,  or agreements or understandings of any nature
         whatsoever,  relating to the  authorized  and  unissued or  outstanding
         capital stock or equity  interests of any New ATS  Subsidiary.  ATS has
         delivered  to ATC true and correct  copies of the Organic  Documents of
         each of the New ATS Subsidiaries, as amended to date.

         4.2 Certain  Information.  ATS has heretofore furnished to ATC true and
correct  copies  of the  Acme  Merger  Agreement  and  the  Intracoastal  Merger
Agreement,  all to the extent such agreements have been heretofore  executed or,
to the extent not so executed, the most recent draft thereof.


                                    ARTICLE 5

                                    CONSENTS

         ATC  consents  and agrees  that,  anything in the  Original  Agreement,
including without limitation Section 6.6, to the contrary  notwithstanding,  ATS
may (a) enter into and consummate each of the Subsequent Permitted Acquisitions,
(b)  enter  into  agreements  with  respect  to the  issue  and  sale of the PIK
Preferred Stock and issue and sell the PIK Preferred  Stock,  and (c) enter into
and  consummate  each of the agreements and  acquisitions  and/or  construct the
communications  towers, in each case referred to in Exhibit C. This consent does
not include consent to ATS' or the Surviving Corporation's issuance of shares of
ATS Class A Common Stock pursuant to a public  offering as  contemplated  by the
May 20, 1998 term sheet with respect to the PIK Preferred Stock.


                                    ARTICLE 6

                               GENERAL PROVISIONS

         6.1  Incorporation  by  Reference.  The  provisions of Article 9 of the
Original Agreement are incorporated  herein by reference as though they were set
forth herein in their entirety.

         6.2 No Other Changes. Except as specifically amended by this Amendment,
the  Original  Agreement  shall  remain in full  force and  effect  and shall be
unaffected hereby.

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         IN WITNESS WHEREOF,  the parties have executed or caused this Agreement
to be executed by their respective  officers thereunto duly authorized as of the
date first written above.

                                American Tower Systems Corporation


                                By:_____________________________________
                                     Name:  Joseph L. Winn
                                     Title: Chief Financial Officer

                                American Tower Corporation


                                By:______________________________________
                                     Name:  Fred R. Lummis
                                     Title: President




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