Radio Navigationmedium#1173
HF radio waves can propagate over long distances because they are:
A
Very powerful
B
Guided along the Earth's surface
C
Reflected by the ionosphere (sky wave propagation)
CorrectD
Transmitted by satellites
Explanation
HF radio waves are reflected (refracted) by the ionosphere, allowing them to propagate over thousands of kilometers via sky wave propagation.
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