To all you interested parties: I finally found someone who knew where the port was located. After trying the dealer I called GM and they couldn't tell me so I asked for a number for Delco. They couldn't tell me either but they gave me a number for an installer. There is a module below the glovebox. On the drivers side of the module there are two connections. A plug with about 8 wires and a single brown wire that has a 1/4 inch square white connector. The plug is a standard mini-coax. I Disconnected the brown wire and plugged in my new antenna. I had a magnetic from a Sirrius kit. I mounted that on my hood just behind the bug deflector and ran the wire through the door. It works OK in most directions of the compass but not all. I'm going to purchase a "Terk" roof mount and put it on top of my camper. Probably find a splitter for under the dash, run a wire to the bed with a female plug next to the camper plug so I have an easy disconnect. Earlier Models are different. The module is in the same spot but they have two ports and a blue wire I was told. One port for Terestial(on the bottom) and one for satellite........Gruber


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