Took the Symphony II radio out of the car to replace it (as its playing up).... Discovered the Audi makes use of two antennas for AM/FM radio reception: ISO male (linky) Fakra female (linky) What I need to know is which (or both) of these should be amplified before being plugged into an aftermarket unit? ...I'm hazzarding a guess that both should be amplified? If it's both to be amplified, then I'm going to have to get something like this: Amplified Double Fakra to DIN adaptor (linky) And a converter for one of the Fakra male plugs to plug into the cars male ISO antenna: Fakra to Male ISO adaptor (linky) Am I correct in thinking this? Surely you need to make use of both antennas (they are there for a reason) to get a good radio signal pickup. It seems to me to be a very strange choice that Audi made in using two different types of antenna connector for the radio, I guess there must be a reason!?