Jon, I can relate! I used to be a tower climber for years! That was when safety ropes were a "good idea". That picture brings back memories for me even though I am only 43. That is definitely a young mans job. The hardest part was being gone 5 out of 6 weeks at a time. I know you know what that is like!
The tallest tower I climbed was 450'. It is hard work! Tell your son to stay safe! Zane