2 antennas? I have 3 on top and 1 in the dash? I have the onstar over the drivers side, The Factory Radio and Factory XM over the Passenger side and the GPS in the Dash. THis is the Reason for asking if the new unit would be able to use the existing XM and GPS. The Factory XM has a Seperate Reciever behind the Glove Compartment that then plugs up to the Factory Head unit. If I have to Abandon these units I dont think I would be interested in the new set up. I have too much time and Money involved in the Installation of them.
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