I can't do that. I experienced some interference with the other electronic in the coppter.Lord knows!
Just place your receiver antenna straight down so you get a good 360 degrees reception and you're away. It doesn't matter which way the receiver is facing, just the antennas. if they are sticking straight out of the back then this is your problem.
I has gone much more awayWell, 1km is about as far as you'll typically get with typical power and rubber duck antennas anyway. Actually, I normally only get about 500m.
Adding an extra receiver will not change that. What you need is a better antenna, more power, or both.