I would say 4 versions when Aluma-Weld wire is considered.
Aluma-Weld wire and cable, not Aluma-Weld boats.
RICH WA6KNW
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When one looks at commercial antenna suppliers one finds that their range of wire antennas such as Broadband deltas and logperiodic arrays ect. come in three versions , HARD DRAWN COPPER , GALVANISED IRON AND STAINLESS STEEL,