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

https://telegra.ph/ElectroCulture-Gardening-The-Ultimate-Starter-Toolkit-05-16

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.