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Which of the following is most likely affected by fading during the twilight period?
  • A
    HF
  • B
    VHF
  • C
    UHF
  • D
    MF

Refer to figure.
Fading may either be due to multipath propagation, referred to as multipath-induced fading, weather (rain), or shadowing from obstacles affecting the wave propagation, sometimes referred to as shadow fading.

Medium frequency is mainly used for AM broadcasting. During daytime, only local stations can be received. Propagation in the night allows strong signals within a range of about 2000 km. Naturally, because of the long distance travel affecting the wave propagation, fading occurs most likely in the lower frequency bands.

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