Not to do with RF, but there are old YT videos of HV linemen who literally hop out a helicopter onto an HV transmission line to manually inspect it. As the heli

Not to do with RF, but there are old YT videos of HV linemen who literally hop out a helicopter onto an HV transmission line to manually inspect it. As the helicopter approaches, they hold out a long pole which is bonded to the aircraft's frame to bring it to the same potential as the line. It starts arcing quite a few feet out until the potential is neutralized and the lineman can "safely" step out onto the line and start working. I imagine this inspection work is done with camera-equipped quadcopters nowadays.