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Agree on diversity antenna. It's at the top of the tailgate so the wires fray when you open and close it. If you have no radio reception that's another clue.
I fixed this on my E91 touring. Drop the headliner at the back and check all the wires. Three of mine were broken. You can sometimes get water ingress on the module. In addition to broken wires I also had a dead antenna module.
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