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The U.S. Navy has operated an Extremely Low Frequency (ELF) test facility, which includes four extensive earth electrodes, in northern Wisconsin since 1969. An integral component of this complex are the four earth electrodes. The electrodes, composed of 4/0 stranded copper cable, have a combined total length of approximately 38 000 feet and are buried at a nominal depth of 60 in. During the late summer...