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MCQ Practice Question
Antenna & Wave PropagationRadio Horizon

Using the common radio-horizon approximation d(km)≈4.12(sqrt(ht)+sqrt(hr)) with heights in metres, two antennas each 25 m high have a radio line-of-sight distance of approximately?

  • A20.6 km
  • B41.2 km
  • C82.4 km
  • D103 km
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Correct Answer: B. 41.2 km
Explanation: sqrt(25)=5, so d≈4.12(5+5)=41.2 km.
Reference: Standard antenna and wave propagation: radio horizon
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