What is the line of sight communication?

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 ?

If the sum of the heights of transmitting and receiving antennas in the line of sight of communication is fixed at 160 m, then the maximum range of LOS communication is_________km. (Take radius of Earth = 6400 km)

Which of the following modes is used for line of sight communication as well as satellite communication?

Is it necessary for a transmitting antenna to be at the same height asthat of the receiving antanna for line of sight communication? A TV transmitting antenna is 81 m tall. How much service area can it cover, if the receiving antena is at the ground level?

Is it necessary for a transmitting antenna to be at the same height asthat of the receiving antanna for line of sight communication? A TV transmitting antenna is 81 m tall. How much service area can it cover, if the receiving antena is at the ground level?

A ground receiver in line of sight communication cannot receive direct waves due to

Assertion: Space waves are used for line -of -sight communication. Reason: Space wave travels in a straight line from transmitting antenna to the receiving antenna.

The height of the antenna ( a ) limits the population covered by the transmission ( b ) limits the ground wave propagation ( c ) effectively uesd in line of sight communication