Okay, I've found out from PolyPhaser that the lightning arrestors on the network referred to in this thread I posted recently were *not* installed correctly. The current setup has the towers grounded ...
NexTek, Inc. announces a family of coaxial lightning arrestors designed to operate at frequencies between 2 MHz and 2 GHz. Providing antenna port transient voltage protection for smaller radio ...
Ceramic base with two brass lugs, original tag. Molded on top: "Aerial / Fleron Radio / Sentinel / Lightning Arrester / Ground"; on back: "Underwriters / Approval E-7191 / Nu-Blac / 17". M. M. Fleron ...