I've got overhead powerlines in my back yard and with my Tmaxx on the stock Trx TQ3 AM radio, I had a run away the 3rd day I ran it and was totally unprepared to deal with that. I got lucky the 1st time - got caught in the bushes and flipped over and motor quit. The next few run aways, I was not so lucky, then I installed a failsafe. The failsafe would activate a few times a week, thats how common the interference was. I've read of probs with AM interference running close to highways - prob CB related from 18 wheelers too.

It stopped completely when I changed to FM and I've never had another runaway or even the failsafe activate. AM will glitch if theres a prob with the antenna wire getting nicked or damaged. You don't have these probs with FM (or 2.4 for that matter). If you're going to go AM, get a failsafe, you're prob going to need it sooner or later. If you live out in the country away from powerlines, you'll prob be alright, but I'd still get a failsafe.