The grounding system I decided to put in place consists of three ground rods roughly 20 feet from the base and 20ft from each other. As I only have approximately 5 feet of soil on top of limestone, each rod is installed at a 45 degree angle with the top closest to the tower.
I looked into using the exothermic systems to fuse the ground rod to the lead. And in the end I chose to simply braze a #5 stranded copper line which is then connected to the tower leg.
And as copper and zinc don’t get along, stainless steel hardware is used to separate the two dissimilar metals.