Materials matter: copper resists corrosion and conducts well

https://www.scribd.com/document/1022891986/Soil-pH-and-Electroculture-Finding-the-Sweet-Spot-136899

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.