Materials matter: copper resists corrosion and conducts well

https://www.scribd.com/document/1031329711/ElectroCulture-Gardening-and-Compost-Enhancing-Nutrient-Cycles-170631

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.