Let's see if I can help. I installed the Drive + Play myself last Sunday to the standard Radio/CD (no NAV) in my 2004 Coupe. I did not have the antenna adapters but modified it in the following fashion: I cut the connectors from both the stock antenna cable and the wired transmitter, swapped them around and soldered them back on. This way the antenna cable plugs into the little wired transmitter box and the cable from that plugs into the back of the radio.

I have no problems with receiving the Ipod or normal FM.

HTH
Dutchie