On Sunday, April 8, 2012 11:04:13 PM UTC+2, Bob Kuykendall wrote:
Once upon a time, I tried many different com antennas on an HP-18, an
all-metal sailplane with fiberglass nose and turtledeck. The most
effective antenna was a bent 1/4-wave whip mounted over the aft
fuselage.

For the HP-24, I install a 1/4-wave dipole inside the rudder, but that
is not a realistic possibility for the Lark.

Thanks, Bob K.

Thanks Bob, I was actually thinking about the possibility of installing the antenna in the rudder since it has fabric cover. The other more extreme option could be to replace the vertical stabilizer leading edge aluminum panels with fiber glass but that might have some structural side effects and I am not sure how much aluminum ribbing will affect an 1/4 wave antenna install.

Certification wise it's not a problem since gliders are treated here similar to experimentals in the US...

Markus