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

https://medium.com/@meleenpprz/electroculture-for-fruit-trees-orchard-applications-that-work-910d444cb5c6

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.