Dude... That looks like badass job to have!!!
Both my brothers work for a company that puts up cell towers and maintains them
My grandfather was an iron worker and actually helped build the kingdom in Seattle (that no longer is there)
They never used fall harness they just had safety belts, he talks about walking the iron without being tied off.
I'd say being high up is in my blood, when I was a littler kid my brothers and I used to climb trees.
Not scared of heights or falls.
it's not the fall that kills you, its the sudden stop!