Propagation is a term that describes the travel of electromagnetic waves, there being three principle main modes of propagation. The first is a straight line travel: the manner that radio waves travel through deep space (ignoring the slight deviations caused by gravity under the theory of relativity). A second way is a skip, which is bouncing between the surface of the earth and the ionosphere (high frequency). The third way is to hug the surface of the earth as it curves around. Radio waves of very low frequency most often travel this way.
`Source - Wikipedia´
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