horizon

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Related to Radio horizon: optical horizon

horizon

noun border, boundary, field of view, field of vision, prospect, range, range of vision, realm, skyline, view, vista
References in periodicals archive ?
The distance to the radio horizon for terrestrial transmitters is determined by the antenna height [h.
Thus the radio horizon has a relative definition depending on the altitude of both the receiver and any transmitters present.
The signal from a conventional communications transceiver typically can be detected by a scanned receiver at 20 miles, by a power detector at 90 miles and by a sensitive radiometer at the radio horizon, perhaps 270 miles.