I have a Cushcraft A3S Beam on a tower. It does not currently have a
lightning arrestor on the feed line and is working well. The feed
arrangement is center conductor to one side of the driven element,
shield to the other side. There is a coil of coax at the top as a
choke. This leaves the elements and the coax ungrounded. I have relied
entirely on disconnecting the antenna for protection. when not in use.
I would like to put an arrestor in the line but recommendations are
sketchy even from those who sell them. I assume it would be most
effective at the base of the tower on the ground rod. The drawing in
the ARRL Antenna Handbook shows the arrestor on a common station
ground.

Comments & opinions please...
de W8CCW John
John Ferrell W8CCW