I've posted this link before, "How to Protect Your House
and Its Contents from Lightning":http://www.lightningsafety.com/nlsi_lhm/IEEE_Guide.pdf
It's an IEEE, the professional electrical engineering society's, recommendations on lighting protection. Well worth looking at. It shows typical residential illustrations. Also covers lighting rods. I'd post it here but it's copyrighted by the IEEE. It's a bit technical but the several examples are excellent. If you have detailed questions after studying it just ask.