Stereo Antenna Harness Adapter for Installing a New Radio Into a Audi, TT Coupe, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Antenna adapter for installing a new Radio into a AUDI TT COUPE 2000, 2001, 2002, 2003, 2004, 2005, 2006 CarXtc adapter plugs directly into the antenna wire beyond the radio found in a TT COUPE Plugs directly into your vehicle radio antenna harness behind the factory radio. Blue Wire connects to the blue wire on your aftermarket wire harness Antenna adapter is needed for your AUDI TT COUPE 00, 01, 02, 03, 04, 05, 06 If installing an FM modulator you will need this and the reverse antenna adapter