A basic setup involves a wooden pole, a copper spiral winding upward, and a grounding spike or buried wire
https://louisqpsa973.raidersfanteamshop.com/from-wires-to-wonders-a-beginner-s-guide-to-electroculture-in-the-garden
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.