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"Verrrry good information.
Can you point to a recipe with schematic and parts fully specified?

If the antenna does take a direct hit, does it destroy the device?
I find it hard to imagine that a GDT can take everything a lightning bolt has to offer.
Or that the series caps could possibly survive."

The schematic & some of the parts information is in this article:

?

See page 3 for suggestions for the Gas Discharge Tube.

Use .01 uf ceramic capacitors.? 1 Kv types and two of them in parallel.? ?Were cheap on Digikey.

I would recommend 100K 1 or 2 watt composition or thin/thick film resistors in parallel with both the antenna and the gas discharge tube.

Or just forget the series capacitor and just put one 100K across the Gas Discharge tube.

If there is a direct hit all of this is likely to be vaporized or toast.

I would suggest that you replace the gas discharge tube every few years depending on how active your area is.? ?an expert to whom I spoke indicated that repeated small discharges slowly raise the break-over voltage of the device.? ??

i'm in a very high activity area so maybe I should do it every 2 or 3? years.? ?You might be in a very minimum area and only every decade or so???

Who knows.

Anyway, while I have had friends have radios destroyed,? I have never ever had one destroyed.? ?

Hope this helps.? ?The important thing is NOT the metal construction, instead the important thing is the SIZE OF THE GRouND WIRE and how good your ground is, and a pretty good ground wire between the two SO-239's also!!!!!!? ? ?ideally these things should be placed on the OUTSIDE of your house.? ?What I have tended to do since my radios are on the second floor, is to position a ground wire right near the coax (you can wrap that or even connect it to the shield) or "near" the balanced line......? ?to create a spark gap that the lightning will jump THERE.

Coax jumps around 5 kV.??

Hope all of this is helpful!!

Gordon kx4z