I have a 1/2 wave dipole on top of my panel cover and a standard T dipole in the nose of my glider. Cables have been shortened to required length. 1/2 wave dipole about 18" T in the nose about 3'. I get 8km to 16 km range.

Details and picture of range analysis. I think the range analysis was from Nephi with 65 powerflarm equipped gliders 2259 data points.

See details on this page:
http://www.craggyaero.com/cables_&_antennas.htm

Richard
www.craggyaero.com