Pegasus912 wrote [snip] . . . I'm hoping that a cheap and effective solution will come along one day that everyone can install. Perhaps like Bluetooth for airplanes, constantly transmitting and with a few miles range so just enough for a warning against an air-to-air.
There is. Flarm. Unfortunately, CAA won't approve it, airlines appear to be uninterested and are pressing only for the impractical (for light and unpowered aircraft) Mode S, so we are stuffed.
Chris N.