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I think the main point is that the base is close to the roof, where the air is not moving that fast (compared to the car) anyway so it does not cause a lot of drag.
The part that is further out than an inch is very narrow, and way shorter than an aerial.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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