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

https://caidenjlyb942.lowescouponn.com/a-complete-electroculture-gardening-toolkit-what-you-need-and-why

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.