"I think my experience would apply to almost any Schleicher glider - they all use essentially
the same fuselage, starting with the ASW24, which do not have carbon in the nose."

The fuselage mold may be the same, but the layup in newer gliders is carbon fiber.

I found a major improvement in range when I moved from a single antenna over the glareshield to dual antennas on the canopy sides of my ASW-27.

I did Range Analysis on six installations and documented the results in the 2019 Free Flight. Look for Antenna Placement:

http://sac.ca/index.php/en/free-flig...ight-vol-libre