We do work on cell towers. Protect yourself. You need a special training certificate to work at the top of working cellular towers. The training cost us $3600. Also, they don't look like they move too much at the top when you're standing on the ground. Once you get up there, there's a bit of a rocking motion you have to compensate for. Torch cutting a hand hole or cable way and welding the ring in is quite taxing. Give yourself some leeway with labor, because your target moves. I liken the sensation to trying to throw darts, where you're sitting in one ferris wheel, and the dart board is on a ferris wheel next to you.
Or, maybe my inner ear is just screwed up from listening to too much Pink Floyd when I was a kid.