Mike,

1. Explain exactly how you get useful ADS-B out in an experimental glider. Key word is USEFUL. Without it, ADS-B in is seriously handicapped.

2. Oh, and a PowerFLARM hooked up to an Oudie "will show you every transponder equipped aircraft in your vicinity with voice alerts for anyone getting too close" for considerably less. Mine has been doing it for a few years now.

Kirk