A basic setup involves a wooden pole, a copper spiral winding upward, and a grounding spike or buried wire
https://www.scribd.com/document/1026190271/Electroculture-at-Scale-Small-Farm-Applications-127430
A basic setup involves a wooden pole, a copper spiral winding upward, and a grounding spike or buried wire, positioned near crops to capture atmospheric ions and gently influence local electrostatic conditions.