On Saturday, April 13, 2019 at 8:01:42 PM UTC-4, Richard Pfiffner wrote:

I mount Flarm A on the top of the instrument panel and the Flarm B and ADS-B in the nose on opposite sides.

Richard
www.craggyaero.com

If your glider doesn't have metal or carbon fiber, seems like the big obstacle to the radio waves is the pilot's body. Would it make sense to mount one (FLARM) antenna in front of the pilot and the other (FLARM) one behind?