XM Satellite Radio P/N 08A15-1E1-000 - Manual (Page 3)

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The XM service is based on two satellites that have fixed positions over the
equator. One satellite for the east coast of the United States and the other for the
west coast. The two satellites continuously broadcast radio signals throughout the
continental United States.
The XM service also uses ground-based antennas that broadcast into areas that
may be obstructed from satellite radio signal. Not all areas that are obstructed
have ground based antennas as a backup signal. XM radio makes every effort to
minimize the areas that do not receive radio signal.
Visit XM Satellite radio at www.xmradio.com or call 1-887-XMRADIO for more
information.
Note: Service activation and antenna is necessary to receive XM Satellite radio transmission
How the service works