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

https://blogfreely.net/galenacmeo/case-studies-in-electroculture-real-garden-results-and-lessons-learned-5r63

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.