With a good FM or PCM receiver you shouldnt have any trouble being 1 frequency apart. We fly foamies standing shoulder to shoulder on 52-53, 35-36 and have no problems whatsoever. Now some of the guys that have the cheaper single conversion mini receivers have had some problems but its an exception not the rule. At our field we fly whatever, whenever PCM or FM, 2 chanels 1 number apart and other than channel 14 we have no problems. We arent sure what exactly is the source of interference but as far as I know, no one flies on 14.