Audiovox XPRESS XMCK-20P - Manual (Page 14)

Step 1: Mounting the XM Antenna
Mount the XM antenna to the roof or trunk of the vehicle. During installation,
make sure you are outdoors and the antenna is not obstructed by tall buildings.
For best results mount the XM antenna to the outside of your vehicle. Below are
the recommended options.
The XM antenna contains a strong magnet, allowing
it to stick to any metal parts of your vehicle.
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Magnet
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Keep excess cable
behind or under
the dashboard.