XM radio
#2
Well, that antenna isn't necessarily for XM - if it's a small black plastic one on the roof, that's OnStar. I believe the XM antenna is the metal one that hooks onto the rear windshield.
#3
Actually I believe the metal one is the analog antenna for onstar. I don't have a black one on my roof. Tried gettin onstar activated last year and they told me mine is analog that in order for me to activate I would need to get it switched to digital. Not 100% sure though.
#4
In 05 Onstar switched to digital so the black shark fin on the roof is for XM. When I bought my car used back in Feb 09, I was able to get 6 months free. I think all I had to do was contact XM.
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