I can't comment on the effectiveness of this air terminal but I should note that researchers have been in disagreement about the effective radius and even if there is one (requires a direct strike). The Swedish study indicates that because of the electrical field of the leader there are varying effective radii, but no optimum design. Most of these studies almost ignore the grounding conductor size or earth resistance,which I find very difficult to understand. To date, there is no proven MOST effective air terminal/grounding design for lightning protection. Bob
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