What is the advantage of a parabolic reflective antenna?

What are the positives of parabolic reflective antenna?
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"A parabolic antenna creates, in theory, a parallel beam without dispersion. In practice, there will be some beam spread. Nevertheless, it produces a highly focused, directional beam."
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"The opposite large by using parabolical antennas is made for microwave radar antennas, during which there's a have to air any small column associated with radio dunes to uncover things including ships, planes, in addition to advised missiles. Using the coming of house satellite TV dinners, parabolical antennas have become one common lineament from the areas of recent nations around the world. "
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