I read about the other case of this happening also, but yours and the other are the only ones I've ever heard of. Not sure how they are mounted to the mast, so have no idea as to cause. The antenna is not that expensive, in fact I have an extra one that I had for 5er, but went a different way. It's not black though, and not sure how it would mount to stationary mast.
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2016 Georgetown 364TS
2014 - 56
2015 - 41
2016 - 81