[VAL] Re: VAL Digest V1 #148 - XM Radio

[waymark1@xxxxxxxx]

XM is satellite radio.
Its coverage is similar to that of the satellite dishes used for TV. You
need an as nearly as unobstructed view of the southern sky in regions
where there are no ground repeaters.
The satellites don't move. They are positioned more than 22,000 miles
above the earth in geostationary orbit. Their beams combine to span the
entire contiguous U.S. while remaining stationary with respect to the
land below. This enables XM's signal to reach from coast to coast. Ground
antennas, or repeaters, keep the signal strong in challenging locales
such as urban canyons.
"Rock" and "Roll" are positioned over east and west coasts and both keep
the entire contiguous U.S. continuously within broadcast range.
Al