I have from my dad's estate the lightening rods that have been on the home for well over 70-90 years. There were five and we managed to get four down, plus a part of a fifth one. One of the four copper rods has a partial break and is bent near the bottom. I have five balls with one of the balls with the glass cracked, but they are all intact. And I tell you this home has had a couple of extremely close lightening hits, so I guess they did the trick!
Anyway, I am seeing some really high prices for the balls and even the rods and I am not sure what they are worth.