Concert HU Removal

col6821

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I've removed the Concert HU from my 2001 S3 but there seems to be 2 aerial leads, 1 conventional and 1 thinner coax cable with a 90 degree connector on it that was connected to the middle of the HU. What is it?

Obviously I don't have anywhere to connect this to on my new HU, and even with an aerial booster connected to the conventional aerial the signal is poor. How can I improve this?

Interestingly the Concert HU doesn't receive radio reception with either of these disconnected, so I'm assuming that they have to be joined together in some way??

Any advice greatly appreciated.