The unused connections are for the USB socket in the centre armrest (6FL) and (I think) for the Sirius module for our friends across the pond. Don't know whether it's also used for DAB in the UK?
Are you sure that the FM issue is down to the aerial? Many FM reception issues are down to poorly shielded cables being used to power a dashcam or phone or similar. Also, do you have a 12v to USB converter in either of your cigarette lighter sockets? They can be very "noisy" electrically, especially the cheaper ones.
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Philip
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