Actually, a 1500 foot tower was how I got the job. I was trimming power line ROWs and was working out the tap to the building that controlled the tower. It was one tree with just one limb to come out, easier to climb it than try to get the bucket truck to it. As I was rappelling out of the tree, hitting the ground, some honcho-looking fella pulled up to talk to us. Somewhere in the conversation, I told him I'd pay HIM to let me climb that tower, lol. He loled but got my number for potential work in the future. Sure enough, he called me a few months later - it seems their regular guy was unable to do it.
That's how I got that gig. He never called me again.