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radio horizon: Meaning and Definition of

ra'dio hori"zon

Pronunciation: [key]
  1. 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.
Random House Unabridged Dictionary, Copyright 1997, by Random House, Inc., on Infoplease.
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