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what does the antennea do? is it necessary to have the OnStar module or will adding the bluetooth antenna be enough? I already have the steering wheel controls from you guys and have them installed. My next thing is to get the PDIM so I can connect/charge my iPod and use the radio/steering controls. I would like to have the added benifit of bluetooth though if I ever want to use that to stream my music so is it possible to do so with just the bluetooth antenna? I have a 2011 LS.
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