American Tower Corporation Correction to Conference Call Number.

BOSTON -- American Tower Corporation (NYSE: AMT) American Tower announced today it will host a conference call today at 10:00 a.m. Eastern to discuss quarterly results and the Company's outlook for full year 2004. The call will be hosted by Brad Singer, Chief Financial Officer, who will be joined by Jim Taiclet, Chairman and Chief Executive Officer.

Please note the correct dial-in numbers are US/Canada: [phone], International: [phone], no access codes required. A replay of the call will be available from 12:00 p.m. Eastern August 2, 2004 until 12:00 p.m. Eastern August 9, 2004. The replay dial-in numbers are US/Canada: [phone] and international: [phone], access code 21200179. American Tower will also sponsor a live simulcast of the call on its web site, http://investor.americantower.com. A replay of the call will be available on the web site shortly after the conclusion of the call.

American Tower is the leading independent owner, operator and developer of broadcast and wireless communications sites in North America. American Tower operates approximately 15,000 sites in the United States, Mexico, and Brazil, including approximately 300 broadcast tower sites. For more information about American Tower Corporation, please visit our website www.americantower.com.