22 July 2020 presentation by Ron Block, NR2B:

Ron Block, NR2B, has been a PolyPhaser Distributor for 31 years and a consultant in the lightning protection field for over 27 years. He is the brother of PolyPhaser founder Roger Block, KD7UT (SK) and the beneficiary of a younger brother's energy, knowledge, and wisdom. The presentation discusses the characteristics of lightning and how it affects us as amateurs, reviews your chances of being struck depending upon location and tower height, and examines how lightning impulse current can be controlled to eliminate damage to your equipment.