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Samples in periodicals archive:
To get the near vertical incidence omni directional coverage, the frequency has to be kept below 8 MHz.
By the time the Germans invaded Poland (1939) Guderian had long worked out the techniques of Near Vertical Incidence Sky-wave HF radio communications and how to use FuG-10 HF radios, both monopole and loop antennas, surface wave radio propagation and the reflective properties of the ionosphere (NVIS) to communicate over huge areas when halted, on-the-move, or in the air.