Prospectus Supplement No. 11 Filed Pursuant to Rule 424(b)(3) (To Prospectus Dated May 19, 2000) Registration No. 333-35412 Prospectus Supplement Dated November 22, 2000 This prospectus relates to the resale by the holders of our: o $450,000,000 principal amount of 5.0% convertible notes due 2010, and o the shares of Class A common stock issuable upon conversion of the notes. This prospectus supplement should be read in conjunction with, and may not be delivered or utilized without, the prospectus dated May 19, 2000. The terms of the notes are set forth in the prospectus. The information in the table appearing under the heading "Selling Securityholders" on page 33 in the prospectus is hereby amended by adding the information below with respect to selling securityholders not previously listed in the prospectus or in any amendments or supplements thereto, and by superceding the information with respect to selling securityholders previously listed in the prospectus or in any amendments or supplements thereto that are listed below: Number of Shares Percentage of Principal Amount of Class A Common Number of Class A at Maturity of 5.0% Stock Issuable Shares of Class Common Stock Notes Beneficially Upon Conversion of A Common Stock Outstanding as Owned That May the 5.0% Notes That Benefically of November Selling Securityholders be Sold May be Sold Owned** 21, 2000** ----------------------- ------------------- ------------------- --------------- -------------- Minnesota Power, Inc. $750,000 14,563 -- ** Less than 1%. ** In addition to the shares issuable upon conversion of the notes. *** Includes shares issuable upon conversion of the notes and additional shares beneficially owned as of November 21, 2000.