Well, the last guyed tower I climbed was in Grand Isle, LA, around 1985; 350'. Large microwave 'jumping off' point to the oil/gas production platforms off the coast in the gulf waters. After that, I swore off it! Not that it was all that 'bad', but it was kinda stupid as we had folks under contract to do the tower work, but I was impatient, and didn't want to wait another couple of days for the guys to get on site. So up I went, to repair some heliax connections and such. Can't even remember clearly whose tower it was (probably a 'shared' tower), or whose antennas they belonged to! But was probably either Tenneco Gas or most probably Exxon, as I was doing a lot of oil/gas microwave/sat work in the 'bidness' at that time, working out of Lafayette and Dallas.