SIRIUS TO INCREASE PROGRAMMING CAPACITY OVER ITS EXISTING SATELLITE RADIO SYSTEM

06-13-2005

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 - 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.

"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.