On 4/25/2018 1:59 PM, Jef Allbright wrote: > The vast majority of the energy in a lightning strike is well below 1 MHz WRONG! Lightning is a VERY short rise-time impulse, so it is an RF event, not a DC event. IEEE studies say that the energy in lightning is VERY broadly centered (logarthimcally) roughly around 1 MHz. 73, Jim K9YC