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

https://arthurelps397.huicopper.com/electro-culture-gardening-for-rootstock-propagation-strong-starts

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.