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I would guess £500 + + from a Dealer so not exactly dear if yours isn't working 😁 Check www.reaoem.com either search by Vin number then through the sections or by the Part number you have. If you aren't aware double click the part number and you should get a list of alternates. Then check the normal Auction sites but don't forget there is a healthy BMW Specialist dismantler network they may help Dave

I would start with the Antenna get the Part Number from the one in the car or www.realoem.com and find a replacement Changing it will take around Half an Hour reprograming your Keys about 5 to 10 mins Or if your a real Tinkerer you could take the Antenna out open it up and see if you can fix it Dave