Awesome work and footage.......I remember watching a program a while back called Worlds toughest fixes on National Geographic channel that showed a crew replacing an antenna with another on a tower of similar height. Surprising that American occupational and safety allows free climbing as the narration in the vid says, thought a static line to hook onto would be mandatory once your climbing outside the structure near the top
Wearing a safety harness is no guarantee you'll survive an accident, people have died from suspension trauma that can set in rapidly after a fall and at that height rescue would be impossible to achieve quickly.