RNS-E aerials

Hi all can anyone help.

I have a 2008 B7 avant with a factory fit RNS-E and I'm looking to get a autodab module to get well dab.

Problem is I'm not keen on the stick on window aerials so wanted to see what roof mount ones there are to replace the standard one. I have searched and can not find much on hear where people have changed the main aerial?

Is there any Audi one I can use? I believe that as standard FM aerial is in the rear windows and the fin is, GSM and GPS, do Audi do a GSM, GPS & DAB fin.

I have found this one not very oem but would it be an easy change? Celsus ICE - car audio accessories

Thanks in advance Adam

Just noticed the late B8 models don't have a roof mounted aerial so where is the dab signal coming from? Late A6's have a fin does this receive a dab signal or is it from another aerial?

Many Thanks Adam