In my Rabbit I have a diversity antenna system so I have two antenna leads behind the dash. My question is should I get two powered antenna adapters (since they both have boosters) and a Y adapter to connect both to my 700bt or should I just connect one of the antennas?? It seems to me I should connect only one lead since differing lengths of wire and and antenna locations could cause the waves to cancel out if they are slightly out of phase and therefore actually make reception worse.

you are on the right track, just connect one. i have done a couple of these cars and one thing i noticed is one of the ant. got better reception than the other so test each one. good luck.

Basically, one fits, one doesn't. Hook up the one tha fits and tape up the other one.

http://www.avic411.com/forum/viewtopic.php?t=5154