What is a space wave ?

What is space wave propagation ? Give one example of communication system, which use space wave mode.

What is space wave propagation ? Why is it limited upto small distance over earth’s surface ?

What is space wave propagation ? Give two examples of communication system which use space wave mode. A TV tower is 80 m tall. Calculate the maximum distance upto which the signal transmitted from the tower can be received.

What is space wave propagation? Give two examples of communication system which use space wave mode. A TV tower is 80 m tall. Calculate the maximum distance upto which the signal transmitted from the tower can be received.