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What is space wave propagation? Give two...

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.

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Space wave propagation is the propagation of waves whose frequencies lie above 40 MHz. Examples of communication system which use space wave mode are :
(i) Television broadcast
(ii) Satellite communication
Numerical : Here `h=80 m=0.80km, R=6400 km`
`therefore` Coverage range, `d=sqrt(2Rh)`
`therefore d =sqrt(2xx6400 xx 0.080)`
` =sqrt(6400x 0.16)`
` =80xx 0.4=32 km`
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