Materials matter: copper resists corrosion and conducts well

https://medium.com/@helduruhpj/kids-and-electroculture-fun-experiments-for-young-gardeners-0e7f4e805c8b

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.