Editing Satellite Internet access (section)

===Line of sight===
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[[File:FresnelSVG.svg|thumb|upright=1.25|Fresnel zone. D is the distance between the transmitter and the receiver, r is the radius of the Fresnel zone.]]
Two objects are said to be within line of sight if a straight line between the objects can be connected without any interference, such as a mountain. An object beyond the horizon is below the line of sight and, therefore, can be difficult to communicate with.

Typically a completely clear line of sight between the dish and the satellite is required for the system to work optimally. In addition to the signal being susceptible to absorption and scattering by moisture, the signal is similarly impacted by the presence of trees and other vegetation in the path of the signal. As the radio frequency decreases, to below 900&nbsp;MHz, penetration through vegetation increases, but most satellite communications operate above 2&nbsp;GHz making them sensitive to even minor obstructions such as tree foliage. A dish installation in the winter must factor in plant foliage growth that will appear in the spring and summer.