Satellite radio is a type of broadcast that works by sending a signal to one or more satellites orbiting the Earth, which then bounces the signal back down to specialized receivers on the ground — most commonly found in cars and home stereo systems. The signals can travel long distances, even across continents, because they’re directed out into space where obstacles like trees and tall buildings cannot block them. The companies that provide satellite radio services also use ground-based repeaters to boost the signal in urban areas where high buildings interfere with the satellite transmissions.
The companies that operate Sirius and XM both offer a variety of channels featuring all kinds of programming, from music to news and talk shows to commercial free and pay-per-song streaming options. They also have forged strategic partnerships with automakers, which integrate satellite radio transmitters into the cars they manufacture. They also sell portable satellite radio receivers and accessories.
Both XM and Sirius are available in the United States, and the services can be accessed using special satellite radios installed in your car or at home, as well as through smartphone apps and portable MP3 player-style satellite radios. In order to receive satellite radio transmissions, you must subscribe to a provider and have a special receiver equipped with a satellite antenna, which is usually included in new vehicles or available as optional equipment.
The first satellite radio services began to appear in the early 1990s, with XM Satellite Radio (AMSC) launching its service in October 1999. XM hoped to become a competitor to rival Sirius Satellite Radio, which was scheduled to begin broadcasting in 2001. The two firms competed fiercely in the automotive industry, negotiating deals with major automakers to include their equipment and services as standard or optional in certain models of car, often including introductory trial subscriptions.
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