I would like to control a simple, ground-based vehicle wirelessly, at ranges up to 5-6 km. The communication would be bi-directional (to get a feedback of "command received") but would only require binary states, just as if I wanted to remotely switch a small number of switches.
I hoped that this day and age there would be plenty of such devices available for USB. I searched for long range USB radio transponders, and got nothing of interest. Most RC toys use high frequency, have a very limited range, and rarely have a USB connection. Wi-fi routers have amazing speeds, but even less range. Normal walky-talkies would have the range, but I just couldn't find readily available devices or ICs which just send a few bits to remotely trigger a few switches.
Does this mean I would need to build the antenna and all the electronics myself, or are there readily available solutions hiding under a (for me at least) unknown term?