XM Satellite Radio XMC10 - Manual (Page 20)

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6. Installation Guidelines
IMPORTANT: For best wireless FM Modulator performance, you
must locate the satellite radio antenna in a location
that is in close proximity to the vehicle’s FM
antenna.
For example, with reference to the adjacent illustration, if your FM
antenna is located on a rear fender or top of the roof, mount the
XM antenna near the rear window location (option 1). If your FM
antenna is located on a front fender, mount the XM antenna near
the windshield location (option 2). Remember, the closer the
satellite radio antenna can be to the FM antenna, the better the
wireless FM reception and sound quality will be. In order to
optimize the operation of the wireless FM modulator, follow the
installation guidelines outlined in steps 1 through 4 as follows:
Step 1.
First, determine the proper location for your satellite radio antenna
based on the following criteria for your specific vehicle:
a. You must locate the satellite radio antenna on the top of the
roof either in front of the rear window (option 1) or behind the
windshield (option 2). The satellite radio antenna will perform
best if magnetically attached to a steel surface with an
unobstructed view of the open sky and minimum of 3 to 6
inches of metal surrounding the antenna.