Why is my GXM 30/30A antenna not receiving the XM signal?

The GXM 30/30A XM Smart Antenna must be under an open sky with a view of the Southern sky to acquire signals from the XM satellites. You must also have an activated XM weather and/or radio service ("Aviator" type XM subscription) to your specific XM radio ID number which can be found on the bottom side of the GXM 30/30A Smart Antenna. You can contact XM radio at 1-800-985-9200 to activate the weather subscription. If you own the GPSMAP 396, be sure that the unit software has been updated to the latest version. Click here for GPSMAP 396 unit software updates.