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Name the type of waves which are used for line of sight (LOS) communication. What is the range of their frequencies? 

A transmitting antenna at the top of a tower has a height of 20m and the height of the receiving antenna is 45m. Calculate the maximum distance between them for satisfactory communication in LOS mode. (Radius of the Earth = 6.4 × 106m)

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Name of the wave may be (i) space wave (ii) radiowave (iii) microwave. 

Frequency for LOS communication must be more than 40MHz. 

Maximum distance between transmitting antenna and receiving antenna is

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