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A transmitting antenna at the top of a tower has a height 32 m and that of the receiving antenna is 100 m. What is the maximum distance between them for satisfactory communication in LOS mode? Given radius of earth 6.4 x 106 m.

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hT = 32 m, hR = 100 m 

R = 6.4 x 106 m

dm =\(\sqrt{2Rh_T}\) = \(\sqrt{2Rh_R}\)

=\(\sqrt{2 \times 604 \times 10^6 \times32}\) + \(\sqrt{2 \times 604 \times 10^6 \times10}\)

= (64 x 102 √10) + 98 x 103 √10) = 144 x 102 √10 machines 

dm = 45. 5 km

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