Materials matter: copper resists corrosion and conducts well

https://www.scribd.com/document/1031814603/Earth-Friendly-Growth-with-ElectroCulture-Gardening-154667

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.