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     EduGorilla 
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    A transmitting antenna of height 20 m and a receiving antenna of height h are separated by a distance of 40 km for satisfactory communication in line-of-sight mode. The value of h (given radius of Earth is 6400 km) is

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    1. 15 m
    2. 20 m
    3. 30 m
    4. 45 m
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