Honda 2010 Accord Sedan Owner's Manual page 164

Playing the XM Radio (EX-L and EX-L V6 models without navigation system)
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.
Depending on where you drive, you
may experience reception problems.
Interference can be caused by any of
these conditions:
Driving on the north side of an
east/west mountain road.
Driving on the north side of a
large commercial truck on an
east/west road.
Driving in tunnels.
Signal may be blocked by
mountains or large obstacles to
the south.
SATELLITE
Driving on a road beside a vertical
wall, steep cliff, or hill to the south
of you.
Driving on the lower level of a
multi-tiered road.
2010 Accord Sedan
Signal weaker in
these areas.
GROUND REPEATER
Driving on a single lane road
alongside dense trees taller than
50 ft. (15 m) to the south of you.
Large items carried on a roof rack.
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