I had to replace the antenna as well -- it had one of those motorized units that busted as 99% of them do.
I just got an adjustable mount, adjustable length/telescopic and angled it 90-degrees, or straight-back / flush with the hatch lid and short as possible. As I see it, the only aero problem is the mount, and hopefully the air flows with the antenna.
Reception from a flat antenna is reduced, but I get all the stations I need except for a few grey areas.
RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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