“Just replaced factory Bose unit on 05 Corvette with this unit. Having trouble hooking up to XM. Should the 573S not be compatible with the OEM factory XM antenna ? Or is the add-on external antenna that came with the compatible tuner required?”
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You would have to get an adapter to incorporate the OEM SAT antenna. Maestro makes one, I forgot the model number though. It's probably $20. Or you can run a new SAT antenna for the SAT/XM Tuner.
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