Name the type of waves which are used fo...

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 xx 10^(6)` m)

sound waves

ground wave

sky waves

space waves

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