2005 Cadillac XLR Owner's Manual - Page 193

Diversity Antenna System The AM-FM antennas are located under the decklid surface in the trunk compartment. the antennas are hidden from view and are not accessible. If adding an aftermarket cellular telephone to your vehicle, do not attach the antenna to the rear glass. This would interfere with the convertible top retraction operation and could cause damage to the finished/painted surfaces. XM™ Satellite Radio Antenna System The XM™ Satellite Radio antenna is located on the trunk of your vehicle. Keep this antenna clear of snow and ice build up for clear radio reception. 3-81