Line-of-sight meaning

Frequency:
An unobstructed path between sending and receiving antennas.
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An imaginary straight line joining the center of the eye of the observer with the object viewed.
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An imaginary line from the eye to a perceived object.
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The straight path from a transmitting antenna to the horizon, representing the normal range of high-frequency wave propagation.
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An unobstructed path from a transmitting device to the receiver. Users are aware of line of sight when they aim their infrared (IR) remote control directly at the TV. Microwave transmissions between towers at the top of mountains and buildings require unobstructed line of sight. See IR remote control.Any Radio FrequencyTechnically, line of sight refers to radio frequency (RF) transmission in general, including Wi-Fi and cellular. Although walls and other obstructions may attenuate (lessen) or block signals entirely, the receiving device must be in the radiation pattern emitted by the transmitter, which is also considered line of sight. See RF.
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See LOS.
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A straight line along which an observer has a clear view.
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(weaponry) The line which passes through the front and rear sight, at any elevation, when they are sighted at an object.
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