Cell Phones and R/C
Actually the problem of digital microwave interfering with our RC activities is more than just possibly from cell phone towers. Starting in the mid 80's and through the 90's it seemed that a lot of business were buying point to point microwave systems for data and voice connectivity around a metro area. For many years we flew RC on the campus of a community college in Scottsdale, AZ. One day a microwave dish showed up mounted on one of the building roofs, and its beam shot across one end of our field. We quickly found out that if your landing approach from the west was a bit high, you would go through this beam and your receiver would be momentarily swamped. I believe this was in the late 80's and there were still a lot of AM radios out there and they fared the worst. Correct- if you flew this beam fast and had an FM radio it was not too bad, but if it was a landing approach with an AM radio, it was hard to recover.
After a while AM radios faded away and most of us flying at this field just unconsciously compensated for this problem.