SIRIUS RADIO AND XM RADIO FORM ALLIANCE TO DEVELOP UNIFIED STANDARD FOR SATELLITE RADIOS

National, February 16, 2000 -- Sirius Satellite Radio (Nasdaq: SIRI) and XM Satellite Radio (Nasdaq: XMSR) today announced an agreement to develop a unified standard for satellite radios.

The standard is expected to accelerate growth of the satellite radio category by enabling consumers to purchase one radio capable of receiving both companies' broadcasts. XM Radio and Sirius will jointly fund development of the technology and work together to proliferate the new standard by creating a service mark for satellite radio. As part of the agreement, each company will contribute its intellectual property to the initiative and have agreed to resolve any pending patent litigation.

"This standard is good news both for consumers and for the category," said David Margolese, Sirius Chairman and CEO, and Hugh Panero, XM President and CEO, in a joint statement. "This will allow for reduced subscriber acquisition costs, more satellite radios in the marketplace, and a simplified choice for consumers."

The unified standard will represent a second generation of satellite radios. At the time of the commercial launches of XM Radio and Sirius, consumers will be able to purchase radios capable of receiving one of the two companies' broadcasts. These radios are already being developed by leading electronics and automotive manufacturers. XM and Sirius will work with their existing automobile and radio manufacturing partners to integrate the new standard under the terms of their existing agreements. All future agreements with automakers and radio partners will specify the new satellite radio standard.

XM Radio and Sirius are each building a digital satellite radio service for consumers, offering up to 100 channels of audio entertainment for a monthly subscription fee of $9.95. For more information about the companies, visit XM Satellite Radio at www.xmradio.com and Sirius Satellite Radio at www.siriusradio.com.

Any statements that express, or involve discussions as to, expectations, beliefs, plans, objectives, assumptions, future events or performance with respect to Sirius Satellite Radio Inc. or XM Satellite Radio Inc. are not historical facts and may be forward-looking and, accordingly, such statements involve estimates, assumptions and uncertainties which could cause actual results to differ materially from those expressed in the forward-looking statements. Accordingly, any such statements are qualified in their entirety by reference to the factors discussed, as the case may be, in XM Satellite Radio Inc.'s registration statement on Form S-1 (File No. 333-93529) filed with the Securities and Exchange Commission or Sirius Satellite Radio Inc.'s Annual Report on Form 10-K for the year ended December 31, 1998, filed under the company's former name, CD Radio Inc. Among the key factors that have a direct bearing on the companies' results of operations are the potential risk of delay in implementing the companies' business plans; increased costs of construction and launch of necessary satellites; dependence on satellite construction and launch contractors; dependence on third-party technology partners ; risk of launch failure; unproven market and unproven applications of existing technology; unavailability of satellite radio receivers; and the companies' need for additional financing.

First there was AM, then FM and soon ... XM Satellite Radio. For more information, please visit XM's new website: www.xmradio.com.

Factors that could cause forward-looking statements (including projections and business trends) in this document to differ materially from actual results are detailed from time to time in XM Radio's filings with the Securities and Exchange Commission.

Press Contacts
Jennifer Markham
(202)380-4315 Phone
jennifer.markham@xmradio.com"> jennifer.markham@xmradio.com