Investor Relations

SIRIUS to Increase Programming Capacity Over Its Existing Satellite Radio System

New Modulation Technology Will Initially Increase Current System Capacity by Approximately 25%, Enabling SIRIUS to Expand Offering of Audio, Data and Video Services While Maintaining Broadcast Quality

NEW YORK, June 13, 2005 /PRNewswire-FirstCall via COMTEX/ -- SIRIUS Satellite Radio (Nasdaq: SIRI) today announced that it has developed a new, advanced proprietary technology that will initially increase the company's total network capacity by approximately 25% within its existing digital transmission system. The technology, known in the industry as hierarchical modulation, will allow SIRIUS to offer additional audio channels, as well as advanced services such as data and video, without affecting the quality of its broadcasts.

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"Our new modulation technology will use a very innovative approach to increase the number of bits we transmit through our satellite and terrestrial repeater networks, enabling us to increase the effective use of our currently licensed spectrum to add additional programming for the benefit of our subscribers," said Jim Meyer, SIRIUS President, Sales and Operations. "Sirius will continue to deliver uncompromised sound quality, and with this new technology we will retain the flexibility to expand our broadcasts even further in the future."

The technology, developed by SIRIUS' Advanced Development Team based in Lawrenceville, NJ, will work over SIRIUS' current network, with minimal upgrades to its satellite uplink and terrestrial repeater infrastructure. SIRIUS has already conducted several tests of the technology to confirm the performance.

The new modulation technology will not impact the customer experience of existing SIRIUS radios sold or currently on the market. Future SIRIUS radios will be outfitted with the new technology, making it possible for them to receive the additional services planned.

"Since our inception, it has been SIRIUS' goal to combine the most cutting-edge technology with the best in creative programming," said Scott Greenstein, SIRIUS President, Entertainment and Sports. "This technological advancement is validation of SIRIUS' ability to excel in both areas of expertise, and to provide our subscribers with innovative services and a unique entertainment experience."

SIRIUS is currently working with its silicon partners to integrate the advanced modulation technology into its chipsets. The company expects to begin offering services using the new technology in the second-half of 2006.

About SIRIUS

SIRIUS delivers more than 120 channels of the best commercial-free music, compelling talk shows, news and information, and the most exciting sports programming to listeners across the country in digital quality sound. SIRIUS offers 65 channels of 100% commercial-free music, and features over 55 channels of sports, news, talk, entertainment, traffic and weather for a monthly subscription fee of only $12.95. SIRIUS also broadcasts live play-by-play games of the NFL and NBA, and is the Official Satellite Radio partner of the NFL.

SIRIUS radios for the car, truck, home, RV and boat are manufactured by Alpine, Audiovox, Blaupunkt, Clarion, Delphi, Jensen, JVC, Kenwood, Pioneer, Sanyo and XACT Communications. Available in more than 25,000 retail locations, SIRIUS radios can be purchased at major retailers including Best Buy, Circuit City, Crutchfield, Office Depot, Sears, Target, Wal-Mart and RadioShack. SIRIUS is also available at heavy truck dealers and truck stops nationwide.

SIRIUS radios are currently offered in vehicles from Audi, BMW, Chrysler, Dodge, Ford, Infiniti, Jeep(R), Lincoln-Mercury, Lexus, Mazda, Mercedes-Benz, MINI, Nissan, Porsche, Scion, Toyota, Volkswagen and Volvo. Hertz currently offers SIRIUS at major locations around the country.

Click on http://www.sirius.com to listen to SIRIUS live, or to find a SIRIUS retailer or car dealer in your area.

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 any forward-looking statements. Accordingly, any such statements are qualified in their entirety by reference to the factors discussed in our Annual Report on Form 10-K for the year ended December 31, 2004 filed with the Securities and Exchange Commission. Among the key factors that have a direct bearing on our operational results are: our dependence upon third parties, including manufacturers of SIRIUS radios, retailers, automakers and programming partners, our competitive position and any events which affect the useful life of our satellites.

G-SIRI

     Contacts: Media
               Jim Collins
               212-901-6422
               jcollins@siriusradio.com

               Analysts
               Michelle McKinnon
               212-584-5285
               mmckinnon@siriusradio.com

               Investors
               Jaymie VanValkenburgh
               212-584-5158
               jvanvalkenburgh@siriusradio.com

SOURCE SIRIUS Satellite Radio

Media: Jim Collins, +1-212-901-6422, jcollins@siriusradio.com, or Analysts: Michelle
McKinnon, +1-212-584-5285, mmckinnon@siriusradio.com, or Investors: Jaymie
VanValkenburgh, +1-212-584-5158, jvanvalkenburgh@siriusradio.com, all of SIRIUS
Satellite Radio
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