Hi I have a 2012 gti with a rcd 510 radio, is it where I live or is everybody elses DAB radio a waste of time, every station I try is 30 second on then 30 seconds off, is there a special aerial that is needed or is the window aerial sufficient for the job?. would never spec a dab radio if ordering a new car, bought car as a pre -reg so was already fitted.Any ideas ?