I agree with Kodiakz. mount the antenna outside. I tried that on my C5 Vette, and it didn't work correctly, and the Vette had a large swept back windshield. The antenna must have sight with one of the two satellites to operate, and when mounted in a windshield the roof will block it when driving in some direction. (Unless you are in an urban area that is covered by ground repeaters.)
Has anyone considered using the standard XM/Onstar anetenna from GM. If you have Onstar and no XM, just replace the GM antenna with a version that has both coax leads.
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Black Sheep Hummer Squadron
(ME TOO)
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