EASA NAV(A)basic
87. LF/MF radio waves, such as NDB signals, travel as…
Answer
Sky wave and ground/surface wave
Explanation
LF/MF signals may propagate along Earth's surface and also via ionospheric sky-wave paths. **Key takeaway:** NDB propagation can support both ground-wave and sky-wave reception. **Glossary:** Sky wave: signal returned or refracted by the ionosphere.
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