The last verticle I had up was a 4BTV. I mounted it on top of a
chain link fence. I bonded the top rail to the mount pole and bonded the
link fence part as well. The top rail was at least 40 feet either side of
where the verticle was mounted. I got out like GANG BUSTERS! Usually people
who complain about verticles not radiating well are the ones who don't work
them against a good ground reference. 17 years as a broadcast engineer put
me onto good grounds....
That's what a friend of mine does here in Tampa. He has a vertical mounted to the intersection of 2 chain link fences. Now he is on Davis Island in the middle of Tampa Bay, and all that salt water don't hurt either!