the locus of points on the earth's surface where rays from a transmitting antenna are tangent to the surface. The radio horizon for a fixed antenna varies with refraction by the atmosphere of radio waves.
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- radio direction finder,
- radio free europe/radio liberty,
- radio frequencies,
- radio frequency,
- radio galaxy,
- radio interferometer,
- radio knife,
- radio microphone,
- radio range beacon,
- radio receiver
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019