Answer
I found the best thing since sliced bread...http://www.crutchfield.com/s-sizkuexw4pn/cgi-bin/prodview.asp?i=142fmmod01
it is
not wireless.
it feeds your audio signal from a headphone jack ( or rca cables) by fm modulation, directly into the antenna input on your radio bypassing the antenna when on, allowing the radio to work as normal when off. it comes with an on/off switch that can used or it can be replaced with a relay powered by the remote wire from the radio (if so equiped).
this is the answer. totally versatile.
