A basic setup involves a wooden pole, a copper spiral winding upward, and a grounding spike or buried wire

https://telegra.ph/Electroculture-in-Allotments-Cooperative-Approaches-and-Shared-Tools-04-25-2

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.