Get a Dynaplate sintered bronze ground plate. Two 1/4" bolts hold it in the hull, so minimal drilling. The bolts serve as attachment terminals for VHF ground and lightning grounding. I''m not convinced that you can get away from direct strike results. I still let go the helm once in awhile when the flash occurs. A lot of people think there''s some magic bullet for lightning, but "protected" boats that do get hit still get fried.