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

https://jaspercymx504.cavandoragh.org/electroculture-and-compost-tea-power-pairing-for-plant-health

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.