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

https://cristiangugz086.bearsfanteamshop.com/the-electroculture-starter-kit-materials-designs-and-safety-basics

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.