As I have mentioned many times before, I am definitely no expert on thunder and lightning.
My philosophy is simple: if there is any risk disconnect everything.
That is antennas, PCs, mains plugs, mains earths etc.. Although the chances of a direct strike are low in the UK, they are not zero. Also, surges in main voltages with storms in the vicinity can cause damage. Always treat storm risks seriously. I keep and eye on approaching storms. If there is any risk, I take these precautions.
If you want to try to prevent damage from a direct strike, very thick straps are needed as lightning can be very powerful.
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