Interference from cell phone towers
We have a 400 ft (guess) cell tower within 1/4 mile of our field (it's behind the flying area so it's not a navigation problem). It's been there for about two years now and no one has reported any abnormal radio problems on any channel. That's not a scientific confirmation of non-interference from cell towers but it's good enough for our club. Cell phones operate at GHz freq.s so I seriously doubt there will be any problems with interference to our RC equipment. Also, several of us in the club have experimented trying to duplicate the "de-programming" of computer radios that's been reported when cell phones are used or are ringing with no results. Seems to be a "phantom" problem. :-)