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Sirius Radio Completes In-Orbit Testing

22 December 2000

    NEW YORK, Dec. 22 Sirius Satellite Radio ,the satellite radio broadcaster, 
today announced that in-orbit testing of its third satellite has been completed.  Payload and signal testing showed all
systems performing to specification. The satellite was launched on November
30, marking the completion of Sirius' three-satellite constellation.  Sirius
is scheduled to begin broadcasting its audio entertainment service in January
2001.
    
    With the completion of its three-satellite constellation, Sirius commenced
its comprehensive quality assurance program. This includes end-to-end testing
and integration of Sirius' receiver, studio, broadcast, transaction management
and customer service systems.

    From its three orbiting satellites, Sirius will directly broadcast up 
to 100 channels of digital-quality radio to motorists throughout the  
continental United States for a monthly subscription
fee of $9.95.  

Sirius will deliver 50 channels of commercial-free music in
virtually every genre, and up to 50 channels of news, sports, talk, comedy and
children's programming.  Sirius' broad and deep range of almost every music
format as well as its news, sports and entertainment programming is not
available on conventional radio in any market in the United States.

    Sirius has alliances to install three-band (AM/FM/SAT) radios in Ford,
Chrysler, BMW, Mercedes, Mazda, Jaguar and Volvo vehicles as well as
Freightliner and Sterling heavy trucks. Numerous manufacturers will furnish
radios to automakers, and will also provide adapters to electronics retailers
that will allow radios in existing vehicles to receive Sirius broadcasts.

    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. 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 in Sirius' Annual Report on Form 10-K for the year
ended December 31, 1999.  Among the key factors that have a direct bearing on
Sirius' results of operations are the potential risk of delay in implementing
Sirius' business plan; unproven market and unproven applications of existing
technology; unavailability of Sirius radios; and Sirius' need for additional
financing.