On Monday, June 8, 2015 at 10:21:31 AM UTC-7, wrote:
Nice suggestions.
I take issue with the zero azimuth as being good enough.
I worry about gliders under my belly and behind and above in my blind spots.
Pull-ups and diving for airspeed are part of soaring.

All the gliders with carbon cockpits and having the antennas under of on the glareshield means that there is a blindspot below the zero azimuth.

Yes, under the belly is important. This is not really an important consideration for testing however. The reason is that it would be essentially impossible to create an installation that would so strongly attenuate in the under the belly direction compared to the zero azimuth directions such that acceptable range is found at zero azimuth and yet is not sufficient for good anti-collision operation in the very very close range that matter for under the belly, etc.