I installed an L-2 antenna with my transponder. While my wings and tailboom
are carbon fiber, the nose of my glider is fiberglass. I installed the L-2
vertically on the bulkhead that closes off the nose ahead of my feet. I've
not noticed any effect on my other instruments in the panel or on my GPS
(CA302). I have noticed that my feet still get cold at altitude, so I don't
think the power output is a problem. The vertical orientation means my
glider is at the center of a very fat horizontal donut.

John Scott