An ordinary mediumwave/longwave receiver even on a ferrite antenna or the whip quite well lightning is detected.
It remains only to listen to the station free of broadcast stations and to detect signals above a predetermined level.
recording them is also not a problem to be? - Kendra commented on July 9th 19 at 13:31
: you can record a normal audio signal with a linear output. And there treat as you like :) - Nathan_Gaylord commented on July 9th 19 at 13:34