Materials matter: copper resists corrosion and conducts well

https://www.scribd.com/document/1026628805/Electroculture-How-to-Measure-Plant-Response-to-Electricity-201386

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.