A basic setup involves a wooden pole, a copper spiral winding upward, and a grounding spike or buried wire
https://arthurelps397.huicopper.com/electroculture-gardening-101-a-beginner-s-guide-to-harnessing-natural-electricity
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.