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In this block diagram, the block designated "antenna tuner" is not normally necessary when:

  a.   the antenna input impedance is 50 ohms

  b.   a half wave antenna is used, fed at one end

  c.   the antenna is very long compared to a wavelength

  d.   the antenna is very short compared to a wavelength
Your answer "b" is not correct. "a" is the right answer.

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