I have an 05 cobalt with the pioneer sounds system and xm. My question is that if I put in an aftermarket deck can I use the stock antena from the xm since i have an xm capable deck? I did a serch cuz i thought that i saw somewhere on here that you cant do that, but i couldnt find it?

 

Unless there's a wiring harness for it no...

Unless, you want to splice the XM antennas wire lead off the cars harness and attach it to the harness on your XM receiver for your new deck.