What is _really_ needed is a replacement of the archaic narrowband analog FM radio. Where you can't listen and talk at the same time. There are probably at least several dozen accidents where the inability to communicate with an aircraft or a road vehicle was a contributing factor.

I would settle for a good digital system with an ability to issue emergency/priority calls to specific receivers. Oh, and full-duplex communication.

I'm practicing for a sports pilot license, and I really have problems with understanding other pilots and the ATC.