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Update, I did digging, worked out some visuals. I installed a few vortex generators around the center behind the antenna in the back plastic piece with a separation of about 11 inches at the farthest points. Gave them about 20 degrees angle. Doesn't really change the fuel mileage much if at all, but certainly seems to increase the wind envelope stability when passing trucks, etc. I didn't have a ton of cross wind today. But I'm hoping to see how well it does in the nasty crosswinds we have been getting as of late.
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