Materials matter: copper resists corrosion and conducts well

https://www.scribd.com/document/1032037849/ElectroCulture-vs-Traditional-Gardening-Pros-Cons-and-Outcomes-185382

Materials matter: copper resists corrosion and conducts well, while galvanized steel is cheaper but heavier; choose durable wood or bamboo for masts, and avoid treated lumber that may leach chemicals.