Installing GPS antenna inside dash in the Volkswagen Golf and Jetta

When retrofitting a satellite navigation head unit to the car you can either install the factory GPS antenna on the roof which is a major job or install the GPS antenna in the area above the head unit where it receives a good view of the sky and minimal interference.

The install process is simple, using [...]

Volkswagen aerial selection control unit / diversity information

Early models of the Mark V had a aerial selection control unit (diversity) under the right front seat to select the strongest signal, in later headunits this function was performed by the headunit itself.  Swapping headunits to or from cars with a diversity unit requires installation or bypassing the diversity unit.

An external diversity box is [...]

Aerial Information for Volkswagen Golf

Vehicles with radio “RCD 300” or “RCD 500” have a rear window aerial with two blocking circuits. The diversity function is carried out directly in the radio unit.
t   If the vehicle is equipped with a radio unit and telephone equipment or auxiliary heater remote control have also been ordered, the rear window aerial with [...]