we have a max also. I was thinking the fm antenna was in the window at the top ?
are you talking about this type of fm modulator
http://www.walmart.com/catalog/produ...uct_id=3579125
if so, my understanding was that the xmitter had stations you could tune to and the fm radio you had to tune to whatever sta the modulator was set to.
You will of course have to switch from the XM band to FM