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Two identical antennas mounted on identi...

Two identical antennas mounted on identical towers are separated from each other by a distance of 45 km. What should nearly be the minimum height of receiving antenna to receive the signals in line of sight? (Assume radius of earth is 6400 km)

A

`19.77 m`

B

`39.55 m`

C

`158.8 m`

D

`79.1 m`

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