I got 6 on 55 and 2 on 2.4.

I almst lost a plane to interference on 72mhz last year. Don't no where it came from and couldn't re create it. But every once in awhile we get some wierd stuff at the field. My planes on 2.4 have never had a glitch but I've only been using it for less than a year. I think PCM recievers might help but the cost is as much or more than the 2.4ghz ones.