An amateur in Germany, DL3IKE, found this recently:
https://www.cia.gov/library/readingroom/docs/CIA-RDP78-03424A000400090001-9.pdf
22 Jun 2018
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1 comment:
Looks like 136Khz should do well but my own earth rod tests at this freq never produced much of note, but I don't have the luxury of 100m spacing nor a well!
73 Ken G4APB
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