I just purchased an 2004 Audi A6 that had the shark fin antenna stock. The radio didn't work so the dealer agreed to fix the radio. They had the car 8 days and I got it yesterday and they replaced it with a single antenna (volkswagon style). Now I am told the satellite system will not work properly. Is this true? I also loved the look of the shark fin and want to tell them to take it back and replace it with the stock antenna. Any feedback?