Finally got around to installing the brick and display, using the antenna configuration that Peter Kelly documented on Valley Soaring Association's site.
http://www.valleysoaring.net/?page_id=1487
And the Butterfly configurator to build a file complete with Mode S code.
http://www.butterfly-avionics.com/in...core-config-en
From inside the carport and on the trailer ramp - lots of metal right in front of the nose - a transponder was displayed 6NM away. I couldn't see the aircraft through the trees.
Waiting until it's had a decent flight test to see how well things work or not.
Jim