On Apr 22, 10:33 am, Jon wrote:
Could reasonable performance
be obtain with elements on the inside surface of the fabric, but out
side the frame?
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Yes. But only when the control tower is also inside of the fabric
(but out side of the frame).

Seriously Jon, if you want to radiate a good signal create a counter-
poise (ie, a 'ground plane') and mount your radiating element in the
middle... outside of the fabric. If you're worried about drag, spring
for a composite antenna with a nicely streamlined cross-section.
Otherwise, do what everyone else does and use a hunka brass welding
rod in a BNC connector :-)

-R.S.Hoover
-(KA6HZF)