A huge deal is the way a whole grounding assembly is installed.
When lightning strikes even a working "protection" (e.g. anthena - cable - grounding), the whole assembly is subject to some serious electricity. And that in turn generates all kinds of secondary effects (powered cable generates some electromagnetic field. When the "power" is those of a lightning, that field is no joke either.) Hence it could still fry stuff around even without "body of lightning", pardon layman's terms, hitting anything but designated route. That's why EM shielding is useful, and distance is a good start at that (e.g. if your lightning-catcher antenna is too close to your radio antenna, EM will cause "secondary spike" in radio circuit, which while weaker then original could still well be enough. Same's gonna happen if grounding cable is laid in unshielded proximity of other wiring.).
By the same virtue it is critical that all components used are on the excessive side - if cable's too "thin", it will work the same way heating spiral in your toaster does when subjected to lightning strike, with the body of yacht playing toast.