Sirius was previously known as CD Radio. Unlike XM Radio, Sirius Radio does not use GEO satellites fro its satellite radio services. The Sirius uplink facility is located in New Jersey.

Sirius Satellite Radio is a satellite radio (DARS) service in the United States that provides 65 streams (channels) of music and 55 streams of sports, news and entertainment. Satellite radio is more than the lastest fad technology. XM Radio provides data services such as weather information for pilots and weather spotters, in addition to real-time weather and traffic updates every two minutes for major metropolitan areas.

XM Satellite Radio provides digital programming directly from three satellites in geostationary orbit above the equator. As of the 2005 season, XM Satellite Radio had exclusive satellite radio broadcast rights to all Major League Baseball games. DirecTV now gives listeners as part of its service the music channels of XM, but not the news or traffic channels.

XM Radio Online gives you unlimited access to over 75 channels of the same amazing programming you hear on XM Satellite Radio. If your brand-name stereo isn't compatible with satellite radio, or if you have a factory stereo system, you can still use a dedicated car satellite radio. In order to begin receiving HD radio, you will need to be within range of a local radio station offering HD radio signals.

Hybrid portable satellite radios will let you save up to 50 hours of content, and let you store and play back your MP3s. To use a brand-specific car satellite radio tuner, you need to have a name-brand, satellite radio-ready in-dash stereo. Satellite TV services are especially popular in rural areas with poor broadcast reception . Currently, two companies offer satellite radio: XM and SIRIUS.