Line-of-sight propagation
Line-of-sight propagation is a characteristic of electromagnetic 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 obstacles.
At low frequency (below approximately 3 MHz) radio signals travel as ground waves, which follow the Earth's curvature due to diffraction with the layers of the atmosphere. This enables AM radio signals in low-noise environments to be received well after the transmitting antenna has dropped below the horizon. Additionally, frequencies between approximately 1 and 30 MHz can be reflected by the F1/F2 Layer, thus giving radio transmissions in this range a potentially global reach (see shortwave radio), again along multiple deflected straight lines. The effects of multiple diffraction or reflection lead to macroscopically "quasi-curved paths".
Podcasts:
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by Timid
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by Pictures In Pieces
Line Of Sight
by: TimidA pierce of no detail,whispers wrongly, slow,calm,but wishful are we now? I've taken all I own. 12 days have come and passed, I act like it does'nt bother me,but it does? I've taken all I own, and shaped with my own hands it seems the same,it seems the same to take what I dont have it seems could only be a long wait piecer sting your own face clearer is my line of sight the day I might give anything Ive taken all I own, and shaped with my own hands it seems the same,it seems the same to take what I dont have it seems the same,it seems the same Ive taken all I need,dont turn your back on me my own family left me here alone.............. I wrapped my arms around you I open up to find you admit you're so gone to have you here with me never understood never understood how could I Your f*cked up love cant have me Your f*cked up love cant have me in your family I see why I've taken all I need dont turn your back on me My own family has left me here alone