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

https://stephensjdc213.theglensecret.com/electroculture-for-shade-gardens-making-the-most-of-low-light

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.