Another things is that they mention "Double Radio Tuner" how does that work? BMW only has that one radio antenna connection.

I know on some of the newer Volkswagen they have two different radio antenna built into the car that requires a double fakra antenna connection. BMW does not have this correct atleast not for the E53?

So maybe this double radio tuner works on their VW model but they market and advertise it to work on all their models the same way regardless if it really works on other models?