Materials matter: copper resists corrosion and conducts well

https://www.scribd.com/document/1021905554/Electroculture-and-Mycorrhizae-Friends-or-Foes-154128

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.