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Adding the XM and Onstar antennas?


CamZ71

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Hey guys, I was wondering if someone could help me out. I have a 04 silverado with stock headunit and no xm nor onstar. I was curious if I could add those two antennas to have them. Has anyone done this before? I know i have to add the mirror with the onstar button but im guessing i have to run new wiring to support xm and onstar?

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