2007 Honda Ridgeline Owner's Manual - Page 148

Playing the XM Satellite Radio The XM satellites are in orbit over the equator; therefore, objects south of the vehicle may cause satellite reception interruptions. To help compensate for this, ground-based repeaters are placed in major metropolitan areas. Satellite signals are more likely to be blocked by tall buildings and mountains the farther north you travel from the equator. Carrying large items on a roof rack can also block the signal. SATELLITE Signal may be blocked by mountains or large obstacles to the south. Signal weaker in these areas. GROUND REPEATER 146