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Which of the following would be expected to affect the quality of signals received in the band normally used for aeronautical mobile service voice communications?
  • A
    The strength of the solar wind.
  • B
    A difference in polarity between the transmitter and receiver aerials.
  • C
    The composition and albedo of the surface of the Earth below the signal.
  • D
    The density of electrons in the lower ionosphere.

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