Maximum usable frequency
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time
Entity
radio
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International Standard Book Number
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radio wave
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reflection
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ionosphere
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ionization
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refractive index
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shortwave radio
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radio frequency
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transmission
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DXing
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rule of thumb
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skywave
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angle of incidence
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radio propagation
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Kennelly-Heaviside layer
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General Services Administration
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Near Vertical Incidence Skywave
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copyright status of works by the federal government of the United States
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