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What is space wave propagation ? Why is ...

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

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Space wave propagation : When the radio waves from the transmitting antenna reach the receiving antenna either directly or after reflection from troposphere, then the wave propagation is called space wave propagation.
Waves travelling directly from the transmitting antenna to receiving antenna (called line of sight communication) get blocked due to curvature of earth. As curvature of earth limits both the line of sight distance between the two antennas and also the maximum distance up to which transmission can be received. So space wave propagation is limited up to small distance over earth.s
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