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Non-line-of-sight (NLOS) (or near-line-of-sight) is a term used to describe radio transmission across a path that is partially obstructed.
Many types of radio transmissions depend, to varying degrees, on line-of-sight between the transmitter and receiver. Obstacles that commonly cause NLOS conditions include buildings, trees, hills, mountains, and, in some cases, high voltage electric power lines. Some of these obstructions reflect certain radio frequencies, while some simply absorb or garble the signals; but, in either case, they limit the use of many types of radio transmissions, including most of those used for Wi-Fi.