Last summer, the power company, was running the cables on a high voltage line, adjacent to the interstate. The towers were about 120', high. There was a very small helicopter, hovering right next to the top of the tower, an a worker was wrenching bolts on the cables, while standing on the choppers skid. He was harnessed to the chopper, but I watched and was amazed. The prop on the chopper was just a few feet from the tower. Seems like a gust of wind, would have been deadly. That worker sure had trust in that pilot!