Indicate which of the following frequencies cannot be used for reliable beyond the horizon terrestrial communications without repeaters?

Indicate which of the following frequencies cannot be used for reliabl

1.	Indicate which of the following frequencies cannot be used for reliable beyond the horizon terrestrial communications without repeaters?
A.	20 kHz
B.	15 MHz
C.	900 MHz
D.	12 GHz
Answer» E.

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Indicate which of the following frequencies cannot be used for reliable beyond the horizon terrestrial communications without repeaters?

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