Materials matter: copper resists corrosion and conducts well

https://www.scribd.com/document/1026625435/Electroculture-101-Unlocking-Plant-Growth-with-Electricity-147005

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.