Yes it came from EBAY, it is made by RICHBROOK and fitted a dream, it comes with a little spanner so you can tighten so it can not be removed easily in car park etc.
Have not noticed a drop in radio reception, but we only listen to "Real Radio" that is FM and AM. Living where we do in Lincolnshire DAB is not very good, it sounds under water most of the time, we do not bother with it. We can find what we want to listen to on FM plus you get "Traffic Program ".
Do you get "TP" on DAB.