MIRAMAR, Fla.--(BUSINESS WIRE)--April 28, 2000--Maritime Telecommunications Network, the leader in maritime communications, is pleased to announce today that they will now provide Inmarsat communication services to the cruise and offshore industries, offering a complete satellite communications solution.

MTN's decision to offer Inmarsat services is two-fold. First, Inmarsat services provides current customers with an auxiliary communications system in addition to their existing C-Band system. Second, this service offers a cost effective satellite communication solution to smaller cruise ships and oil and gas vessels, whose needs do not require a full time communications solution system. MTN can now better fulfill the cruise and oil & gas industry's communications needs by delivering the high quality of service necessary for maintaining a competitive advantage in today's marketplace.

MTN has formed a strategic alliance with Stratos, an international leader in the provision of mobile satellite services. "We are proud to have selected Stratos, because of their extensive range of Inmarsat services and their superb technical knowledge of complete end-to-end Inmarsat service as well as the various products available for use over these networks," stated Bradford C. Briggs, VP and General Manager of MTN. "We are enthusiastic about supplying our customers with an array of communication solutions."

The following Inmarsat services are also available through MTN's alliance with Stratos:

-- Global satellite coverage in Inmarsat -A, -B, -C, -M, and Mini-M

-- Global internet access and e-mail capabilities

-- Sophisticated International PSTN interconnections; providing

faster call setup

-- Flexible billing

About Stratos

Stratos is a full service communications provider of remote data and voice services. It owns and operates Land Earth Stations (LES) around the world, providing the international gateways to the public switched networks for Inmarsat calls. Stratos' customer base includes diverse markets including merchant, navy, cruise, and yachting vessels, general aviation, fishing, oil and gas industries, natural resource exploration companies, humanitarian aid organizations, journalists, UN peacekeeping operations, government agencies such as military, fisheries enforcement, Coast Guard and Emergency Measures. More information is available at www.stratos.ca.

About Maritime Telecommunications Network

Maritime Telecommunications Network (MTN), the leader in maritime communications, provides C-Band voice, fax, data and Internet communications as well as Inmarsat services to the cruise and offshore industries, and the U.S. Navy throughout the world. MTN also provides ship-to-shore live video and radio broadcast capabilities in C- or Ku-Band. MTN is owned by its parent company ATC Teleports Inc., which is a wholly owned subsidiary of American Tower Corporation (NYSE:AMT). More information is available at www.mtnsat.com.

This press release contains "forward-looking statements" concerning future expectations, plans or strategies that involve a number of risks and uncertainties. American Tower Corporation, "the Company", wishes to caution readers that certain factors may have affected the Company's actual results and could cause results for subsequent periods to differ materially from those expressed in any forward-looking statement made by or on behalf of the Company. Such factors include, but are not limited to (i) substantial capital requirements and leverage principally as a consequence of its ongoing acquisitions and construction activities, (ii) dependence on demand for wireless communications, use of satellites for Internet data transmission, and implementation of digital television, (iii) the success of the Company's tower construction program and (iv) the successful operational integration of the Company's business acquisitions. The Company undertakes no obligation to update forward-looking statements to reflect subsequently occurring events or circumstances.

     CONTACT:  Maritime Telecommunications Network, Miramar
               Nancy Price or Heidi Gorton
               954/538-4018, 954/431-4077-Fax
               e-mail: Mtn_info@mtnsat.com