My car had a dud antenna too, its control board had micro pieces in it and one was fried.

I found the box on ebay for 5 dollars plus postage. - It was a 202 part no. but was the same fitting and wiring plug too. Worked a treat.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)