Materials matter: copper resists corrosion and conducts well

https://blogfreely.net/galenacmeo/electro-culture-gardening-for-tropical-climates-heat-and-humidity-tips-6tq6

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.