@berton902, did you get to the bottom of this? My DAB used to work fine, now I get hardly anything. I tried buzzing out the two coax cables between the DAB module in the boot and the antenna module under the spoiler. The grounds are fine but there is no continuity in the middle of the...

^^^ thank you for the link to this. I have bought the same one and it works for me on my 2014 L405 Range Rover. My previous cable couldn't read the medium speed CAN. @PRO thank you so much for the VM! Works flawlessly!

Just put the PSU across/in parallel with with the battery