Radio Controlled Helicopters

jr_9950 asked:


How are UAV's controlled all over the world without any signal interference?

Is it just a really powerful transmission output? Or as I assume, probably using a satellite to bounce the signal?

I always thought it would be neat to house a camera and fly my R/C heli from a screen, but you would risk the helicopter losing signal and crashing if it went too far.

Are there types of radio systems for R/C helicopters which could allow them to be controlled up to say 1-2 miles away?