Line-of-sight propagation refers to electro-magnetic radiation or acoustic wave propagation. Electromagnetic transmission includes light emissions traveling in a straight line. The rays or waves may be diffracted, refracted, reflected, or absorbed by atmosphere and obstructions with material and generally cannot travel over the horizon or behind o...
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http://en.wikipedia.org/wiki/Line-of-sight_propagation
propagation between two points for which the direct ray path is sufficiently clear from obstacles for diffraction to have negligible effect
Found on
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=705-02-31
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