Vehicle : Audi A4 1.8T Stereo: Factory Bose Antenna: Trunk Lid, forward lip Unit: On cell phone mount, near shifter/ lower gauge cluster We have had XM for almost a year, and it is outstanding. We run the Delphi, and the interface is excellent. Cheap, fairly inexpensive to install. The sore point is that they don't offer a "Car" or "Home" PACKAGE, that would include the components neccesary for install, rather than purchase separately. It all has to be purchased in pieces. We enjoy the many channels and lineup is ecclectic. "Fred" is my favorite, "Comedy" is my wife's. The lineup covers everything from Talk Radio, Metal to 1950's music, I don't think you can find that anywhere. www.xmradio.com Never had a single problem with coverage in the Wash DC area. Never without service, but this is their hub. There was an excellent writeup of the history of XM in the Washington Post magazine. I will post the link if I find it.