Using the Factory XM tuner, antenna with aftermarket

[deicustoms1]

Ok, so I would just need the XM tuner for my avic-n2, then where would I find the cable for the antenna? And would that plug right into the pioneer xm tuner?

I probably won't be keeping XM, just if I had all the items already, I was going to try to hook it up while I was installing the headunit. thanks

Also, I don't suppose I can tap into the antenna (I assume it has gps) and use that as the gps antenna for the avic-n2? If not no big deal, no one will see the pioneer antenna on the roof anyways.