From my experience, most so called 'lightning damage' isn't from a direct strike.
Most is caused from an induced pulse of voltage via EMF.
A current, say the lightning strike following some path to ground, parallels some conductor carrying AC power to your home.
This could be close, in your neighborhood, on your property, or many miles away along the power line. The closer the strike, the greater the induced voltage pulse on the power line.
No grounding that could be done on your property will protect from this. But there are ways to minimize it's chances of taking out any of your electronics.
A '
Whole House Suppressor'
To back that up one can employ quality power strip suppressors AND run all power, phone line, and coaxes through it. Put a 3 (or more) turn loop in the wires that run to your equipment from the power strip. Be sure to have the power strips power cable straight to the outlet. ( See note)
BTW: I don't have the 'whole house suppressor' but do the backup alone.
I rely on the 'cone of protection' offered by taller structures near the house. The closer, and the grater the ratio of height, the more effective this is.
Haven't had a strike on the property in 20+ years, but the one then, took out an oak tree about 40ft from the closest point of the house.
The oak
was about twice the height of the house. Nothing was damaged in the house. (this yr, since May, has had more than a normal number of severe lightning storms, but there's more trees, and they are taller now.)
IMHO, if the house were covered with lightning rods, it could have attracted the strike away from the oak, and saved it.
FWIW: When I employed the loops on 300 ft radio towers, on 2 - 300 ft buttes, in Western N.D. eastern MT. , just before the lines entered the radio cabinets. Lightning service calls went from a dozen a month to about 1 call in three months. /FWIW
If the local area has many reoccurring direct lightning strikes, chimneys blown apart, metal siding burnt and scattered on the lawn, etc. I'd do extensive grounding for lightning. NEMA guide lines fall far short in this area IMHO.
Wish I could find that thread as there is a very valuable link in it detailing effective lightning grounding while conforming to NEMA.
NEMA guide lines are more concerned with preventing a strike from entering the power grid from a strike on your property, IMHO.
note: reason they say NOT to 'take cover' close under that tree.
The tree is the most likely to get the strike. (It's tallest thing in the area) if the strike doesn't jump from the tree to you, and the ground you're standing on doesn't get 'charged, your body will still be the 'parallel conductor'. You're safer [IMHO] sitting on the ground, 2/3ds the trees height, away from it.
Harshness: I think he went insulated to minimize/eliminate the effects of electrolyses from discoloring the siding.-