XM Satellite Radio P/N 08A15-1E1-000 - Manual (Page 4)

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Satellite signals are received best in the areas
where there are no tall buildings, trees or tall
objects that can obstruct the signals.
Locations where satellite signals are received easily
There may be ground-based coverage in some of these areas that will provide
uninterrupted service of satellite radio. The XM radio will not operate only when
there is no signal from both satellite and ground-based antennas.
Satellite radio signals may not be received in areas listed below.