Is that a guess or is there actually a grandfather provision in the FCC rules or federal law exempting broadcasters from safe RF limits in such cases?
Here's what I know. The WABC tower in Lodi was built in 1944. If you look at the satellite photo of that area, none of those buildings were there in 1944. I've visited dozens of old AM towers all over the country, and most of them are in populated areas. But when they were built, it was all vacant land. The people who build close to those towers know what they're getting, and you can't tell some else they have to move because you want to build close to them. If they're concerned about RF, they shouldn't build there. I don't know what the FCC thinks about it, but I know legally that the broadcasters were there first. Just like the railroads. They own the right of way. You build close to them, and you're guaranteed to hear trains go by at night.