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Antenna & Wave PropagationFresnel Zone

For good practical line-of-sight link clearance, a commonly used planning guideline is to keep at least about what fraction of the first Fresnel zone unobstructed?

  • A20%
  • B40%
  • C60%
  • D100% in every possible situation
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Correct Answer: C. 60%
Explanation: A widely used engineering guideline is about 60% first-Fresnel-zone clearance to limit diffraction loss.
Reference: Standard antenna and wave propagation: fresnel zone
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