Counting the Tesco Club points
Aerial that screws in can't be for Telephone as I haven't got Phone prep in my wifes allroad.
The system runs diff aerials and the screw in aerila is the primary FM one. the system is constantly looking for the best signal; that is why the radio dips for a second sometimes. The base of the aerial only recieves GPS data.
There are aerials in the rear windows(saloon) and both rear side windows on avants. hope this info helps
I pick up my RS6 tom morning and can't wait, saloon with shark fin aerial