I never could figure it out either. They put the signal booster on and plugged into an outlet below my television. Anytime we had a lightning storm nearby the box would always get fried but it never really bothered the television. They always said to not install arrestors as it adds noise and attenuated the signal too bad.That's interesting. I can't see how a "signal booster" would have anything to do with what you are talking about. Damage to the TV is usually caused by the cable ground from the pole or pedestal carrying a surge or current back through the TV to the receptacle ground, (a ground loop). This is exactly the reason you would want to use an isolator as I mentioned above. It separates the grounds where the cable enters the house. Lightning and surges stay outside. Your cable in the house is grounded to your service ground which is the same as your receptacle grounds.
One real bad storm it burnt out the first HDMI port. During the summer that year I bet I went through six cable boxes before it burnt the port. I didn’t care because it was their boxes. When it burnt out the second HDMI port I had enough..
They removed the booster and plowed a larger line to my house.
I filed a claim but it was no use. I don’t have enough money to fight spectrum.