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Your experience is similar to mine. I assume your dog didn’t vaporize. I have thought that buried wires would probably shunt a strike to ground through the insulation but this doesn’t seem too scientific.
Here, all wires are grounded at the point of entry to the electrical ground stake. I had a hit to a tree 10 feet from the house which took out all my phones, some audio stuff, two garage door openers, and half of the tree, yet my ham radio and part 15 stuff survived. I can’t say it was the grounding which save it but it sure didn’t hurt. (As an aside, this was the second time in my life that I have seen plasma lightning…my neighor saw it also so she will witness to those who don’t believe this).
Do you think it would be a reasonable idea to at least ground one of the power and one of the audio leads for an outdoor transmitter to the electrical stake ground?