Materials matter: copper resists corrosion and conducts well

https://www.scribd.com/document/1026440688/Electroculture-for-Beginners-Simple-Setups-and-Safe-Practices-178833

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.