ORIGINAL: Maximilionalpha
I use Spektrum Ar6210, w/Sat. Rx and my DX6i. Well, maybe my setup is kinda like the Road Runner(Beep, beep) , who didn't learn about gravity???
My next recorded feat, will be to attain an altitude of 3500-4000ft AGL, by naked-eye alone.
You've been somewhat lucky and probably flying in a relatively RF noiseless area extending your range.
There are plenty of posted videos where both 2.4gHz and 72mhz line of sight ranges are tested.
2100' or so is about the max range. In the videos you see a LOT of frame loss after that, and by 2600' a complete loss of control unless something like a "Cantenna" is used. Even here range barely approaches 3100'.
I've had gliders up around 2100 AGL, and could not see the plane at all.
I hope you are flying at least 15 miles away from any non-private airport.