Materials matter: copper resists corrosion and conducts well

https://www.scribd.com/document/1022719499/Electroculture-Gardening-Tips-for-Urban-Balconies-and-Small-Spaces-198842

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.