I have the XM Delphi unit, I believe it's similar to the roadie. Anyway, I used an FM modulator to play the XM through the existing head unit. This does work but does not give the best fidelity. As for the antenna, I put it in the bow of the boat, under the fiberglass, just below the bow light. I placed the antenna, flat side down on a piece of Dynamat, the put some silicone glue on the Dynamat and stuck it up in there. Seems to work very well.
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