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

https://jaspercymx504.cavandoragh.org/electro-culture-and-rainwater-harvesting-synergistic-strategies

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.