Hi all, So went pretty much straight up with my copter yesterday. No mods, got to about 850 feet at which point control signal was lost. I had my range extender flat part pointing at the drone and the 2.4ghz control antenna parallel with the ground so as to not have the null zone on the copter. Why was control lost so early? This seems like quite a small distance to what i was expecting? I have read a few threads which seem to indicate going straight up isnt great but i dont get how it makes any difference so long as you set up your control antennas to compensate?