If you want a useful aid then consider FLARM!
Not really.
There are people with FLARM, there's other folk with transponders. There's folk flying metal aircraft that show up as a primary on RADAR. I found out Monday that our TMG, even with a great lump of a Volkwagen (sorry, Limbach) engine still doesn't show on primary 10 miles from the radar head.(no FLARM or transponder, just a radio). Radio isn't actually a waste of time, but is of limited value for traffic avoidance.
The only solution is to make it law that every airborne vehicle above 400' agl carry ADS-B (when they get it working and light enough). Until then, lookout!
TOO