Hi all, First time posting and would appreciate advice. I'm trying to take my Phantom out as far as possible and I'm wondering if there is an optimum height to get best reception. Logic would suggest my P3a should be horizontal to the controller but I'm wondering if the further you go out the more altitude you should consider applying. I want to breech 4miles, currently just under with a parabolic range extender. All tests done in a safe manner. Thanks for advice in advance.