Is XM being transmitted using airwaves (terrestrial signal)? Where are the repeaters?

[SolidSignal_FAQ]

Is XM being transmitted using airwaves (terrestrial signal)? Where are the repeaters?

[SolidSignal_Musa]

Yes, XM Signal repeaters have been installed in most metropolitan cities with hi-rise buildings.

An XM Signal repeater is a way to insure that the satellite signal reaches all subscribers, even with building like obstructions in the way.

This rebroadcast of the XM satellite signal is sure to provide continual signal to all XM subscribers.

The wide network of XM Signal repeaters consist of transmitters strategically placed around the nation. The repeater receives the signal from the satellite and simply re-broadcasts it at a stronger level, similar to FM. This will allow XM to be re-broadcasted to penetrate the walls, concrete, and metal structures.

Due to FCC regulations the location of all of the repeaters is currently unknown.

However, here is a list of all metropolitan areas that definitely have repeaters installed:
Akron
Albany
Albuquerque
Atlanta
Austin
Birmingham
Boston
Buffalo
Charlotte
Chicago
Cincinnati
Cleveland
Columbus
Dayton
Denver
Detroit
Dallas/Ft. Worth
Greensboro
Greenville, SC
Harrisburg
Hartford
Houston
Indianapolis
Jacksonville
Kansas City
Knoxville
Los Angeles
Louisville
Las Vegas
Memphis
Miami
Milwaukee
Minneapolis
Monterey
Nashville
Norfolk
New Orleans
New York City
Oklahoma City
Orlando
Philadelphia/Wilmington
Phoenix/Tucson
Pittsburgh
Portland
Providence
Raleigh
Richmond
Rochester
Sacramento
San Antonio
San Diego
Seattle
San Francisco
Salt Lake City
Springfield, MA
St. Louis
Syracuse
Tampa
Toledo
Washington DC/Baltimore