Lighting Arrestor

Donald,
I am not sure what kind of lightning arrestor you have, but I use 3-wire, 4-wire, and individual arrestors (technically called varistors) on irrigation control systems. They work great if they are in the right places. I have found that the most effective place to put them is closest to the source of the lightning strike. In your case it may be the tower itself. Each wire going up the tower gets one lead of a varistor, the other lead of each varistor goes to a good ground rod. In some cases I will install fuses at both ends of buried wires. Lightning will still wreck your stuff, just not as often. The best defense against lightning is a complete disconnection of all conductors.

Any other ideas/suggestions?

Eric