In case of line of sight reception, there are two components of the signal. One is the direct signal and other is the signal reflected from the ionosphere. Both the signals leave the antenna with the same signal phase, but travel different paths to the receiving antenna. These paths may be of different length. Because the reflected signal suffers 180 degree phase reversal at the point of reflection, the two signals may aid or oppose each other in the receiving antenna. The resultant signal may be stronger or weaker than the direct path signal alone which is not desirable.
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