this might sound stupid but why do some gti's have an ariel on the roof and some dont, mine dosnt and think it looks better but why have some go them on the roof??
Earlier model year mkv golfs 04 and 05 I think had the aerials in the rear window. eg My 04 GT TDI had no aerial on the roof but rather in the rear windscreen which looked better in my opinion. My 06 R32 however has an aerial on the roof, I do not have sat nav or anything. VW rolled it out to cut costs. Aerial in the rear windscreen is more expensive. Hence the whole cost cutting approach we have been hearing about for the MKVI Golf. They started to cut production costs already in the current generation