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What is line of sight communication? Wh...

What is line of sight communication? Why is it not possible to use sky waves for transmission of T.V. signals? Upto what distance can a signal be transmitted using an antenna of height `h`?

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(i) Communication in which there is direct and unobstructed path between transmetting device and a receiving device. For example microwave are propagated in this manner and repeater can be utilised to extent their range. Example : FM radio, microwaves.
(ii) Transmission of TV signal is not possible through sky wave propagation as ionosphere transmitting and receiving antene should be ,
`d_(M)= sqrt(2Rh_(T)) + sqrt(2Rh_(R))`
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