i recently did an install on a 2006 passat 2.0t and used the factory sat. antenna with the pioneer sat i put in....guess what...the factory ant. in that car is the new style 1 wire and oddly enough it works with xm or sirius. im not 100 percent sure what the second wire was for but i suspect factory gps antenna.hope this helps. btw on his i snaked the wires through the little passthrough behind the passenger side rear seat and installed the tuner in the passenger side rear seat bolster and it fit in there pretty well. have fun... i really like the new passats
