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Radio waves, Surface wave, Space wave - Coggle Diagram
Radio waves
Sky wave
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Main uses
navigation signals,AM and shortwave radio signals
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Surface wave
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Range
About 1,500 km at low frequencies
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Space wave
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Range
In space unlimited, on earth limit of orizon (150km)
Main uses
FM radio, VHF and UHF TV signals
direction
In a straight line, can be relayed by satellite
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