The factory NAV antenna is mounted in the dash. Since I junked the OnStar, I used the OnStar's GPS antenna on the roof instead.
Send me your email address in a PM, and I'll send you my XM Radio install PDF. It will give you an idea what is involved in installing the GM XM Kit.
BTW - I just finished an 800 mile trip to Memphis and back. With XM installed, we didn't listen to any CDs at all!
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