[Viet Nam Vette]

I have the Factory Nav and OnStar which are in the same Shark Fin Antenna. When you order factory Nav,Onstar,XM...it all comes in the Shark Fin Antenna on the Passenger side front roof.


Mine only came with OnStar and Nav. The Dealer XM add on placed my small box shaped XM \ antenna on the very front center of the roof with the lead wire tucked under the rubber windshield molding that leads into the cabin to the radio XM module.

After I added the Roof Marker Lights ,the XM antenna was moved directly behind and centered up against the Marker Light rear base.

The Antenna likes the roof mount the best ..as the large metal roof area acts as the receiving "Ground Plane" that reflects the signal to the antenna. Best recption will be found on the roof even though it will work inside,..... the roof is still the best place.