Hi Markus,

I recommend this one.
http://www.cumulus-soaring.com/rami.htm#AV-534

I had one of them on my Schweizer 1-35C. It worked great. I had it mounted
on the fuselage behind the turtle deck. The fuselage acted as a nice ground
plane.

For a metal sailplane there is no way to mount a radio antenna internally
and get good performance. And there aren't any available low drag radio
antennas that I'm aware of.

Best Regards,

Paul Remde
Cumulus Soaring, Inc.
_____________________
"Markus Graeber" wrote in message
news:28640239.2914.1333890736652.JavaMail.geo-discussion-forums@ynmc17...
Happy Easter everyone! We have a IS-28B2 Twin Lark which we use quite a bit
for instruction, it is good for spinning and intro into flying complex
gliders (flaps & retractable gear). It is due for a complete overhaul which
will include a new radio with a repeater control unit in the back for the
instructor.

Since we´ll then be re-working the whole radio install anyway I have been
considering doing something about the dragmaster factory radio antenna that
looks more like a car antenna installed ontop of the fuselage tail boom. For
you experts out there what would be your recommendation for an interior
radio antenna install (or a low drag exterior install) in an all metal
glider like the Twin Lark?

Many thanks in advance,

Markus Graeber
Aeroclub de Colombia