[TowerTalk] tower grounding

[Spencer]

I did some maintenance on a steel boat. The utility company had 
connected the ground to
the hull when connected to shore power. There was serious corrosion 
problems. I measured
the ground wire current with a amp-probe, 3 amps. I disconnected the 
ground and the problem went away.
Your tower might be the ground connection for the electric utility 
company. The waveform is
distorted and has a DC component that will cause big problems and a nice 
place for current flow
during a lightning strike.
Spencer
W1GAK