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  4. If the height of transmitting and receiving antennas are 80 m each, the maximum line of sight distance will be: Given: Earth's radius =6.4 × 106 m

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Q. If the height of transmitting and receiving antennas are $80\, m$ each, the maximum line of sight distance will be:
Given: Earth's radius $=6.4 \times 10^6 \, m$

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Solution:

Maximum line of sight distance between two antennas, $d _{ M }=\sqrt{2 Rh _{ T }}+\sqrt{2 R \cdot h _{ R }}$
$d _{ M }=2 \times \sqrt{2 \times 6.4 \times 10^6 \times 80}=64 \,km$