Adam Savage of Mythbusters linked to this on Twitter. If you're scared of heights like I am, you will probably find this uncomfortable. I was practically screaming at the guy to put on his safety clip for about half of this movie.
It's just... ohmigod. You could not pay me enough to do this job. As one of the commenters said, "I would prefer to shit my pants."
EDIT: Apparently the video was taken down for weaksauce reasons. From the OLE blog:
I sent out an email this weekend advertising a new video about tower climbing. It was a great video and I wish I could show it to you but the person I got it from expressed some concerns about how it reflected on the tower industry and ask me to take it down. So I did.
EDIT 2 ELECTRIC BOOGALOO: Thanks to the internet regarding censorship as damage and routing around it, another video has been set up. Let's see how long this one lasts.