I don't know if FCC rules have changed on height but I thought it was 40' max, but it might have changed.
I had no idea there was a height limit on towers down there in the U.S. !! I wonder if that is still an actual rule or if it has been done away with ?
Up here in Canada there is no limit on height, and radio towers are considered a federal matter, which means that if you are a licensed radio user, tower construction and use CANNOT be regulated by a municipal or provincial authority (or a HOA). This applies to hams, land mobile, CB, broadcast, all of it...
As a federally regulated service, CB is treated the same as any licensed radio service here (there is a blanket license that covers all users).
You are supposed to get an aeronautical clearance form for towers over 100 feet, but it's just a simple form you fill out and submit. It's not an issue unless you are very close to an airport.
As you could imagine, this arrangement results in many conflicts between radio users and various authorities & NIMBY groups who find themselves helpless to prevent towers going up!
Often they find ways to have the towers removed regardless of federal law.
As well, many cities here make & enforce bylaws against towers, even though they know they don't have authority to do so !
Cell companies are sometimes forced to disguise their towers as trees........
It's a big legal mess, with most court cases being found in favor of the tower owners but with enough dissenting decisions to make for no clear precedent.