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The induction field caused by MF broadcast waves can occasionally be a safety concern during maintenance and inspection work on transmission lines. In this paper, we examine a coil grounding and we put forward a method of selecting ground points (steel towers) with the aim of reducing the induction field and thereby ensuring better safety. The frequency characteristics of the field strength is obtained by numerical calculation. In addition, the effectiveness of the grounding methods is confirmed by showing the measurement result and the calculation result of the field strength in the vicinity of the bottom conductor.