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Depending primarily on its frequency,radio wave may travel from the tranmitting to the receiving aerial in a number of ways.The most important of these are :

1. Ground waves (or Surface waves):they are useful for low frequencies of below 1000 KHz .

2. Sky waves: the transmission of radio waves in the frequency range of 3 to 30 MHz.

3.Direct waves( or line-of sight waves):At frequency above 30 MHz ,radio transmission cannot be carried out by ground wave or sky wave.

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