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

https://daltonbcvh980.cavandoragh.org/electroculture-turning-spark-into-blossom-with-smart-wiring

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.