You can make a wing shaped sleeve for the antenna too.
Theoretically that can reduce drag by 90%, see http://ecomodder.com/forum/showthrea...rag-25378.html.
I made a plastic wing shaped sleeve (painted it black, that's not in that link yet) and found it made no measurable effect, as expected.
I guess it helps a tiny bit.
Made of leftovers, if it saved me 0.01 liter of gas it already earned itself back several times over 
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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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