Receiver problem?

[Dagger Thrasher]

I also have a similar problem with Cold Fusion...after a distance, the reception just goes. I've changed receivers, transmitters, crystal sets, tired adjusting the aerial length and position...you name it. The ony thing I can think that *might* cause it would be that the 5V BEC my ESC puts out isn't enough...but I doubt it, the receiver (Hitec 2RNB) is designed for 4.8-6V. I'm stumped.