-- card: 53104 from stack: in
-- bmap block id: 0
-- flags: 4000
-- background id: 7720
-- name: #173
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on openCard
  global group,rightone
  put 18 into group
  put "D" into rightone
  pass openCard
end openCard



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Question #18

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4BD-4.6 What type of antenna is most useful for sky-wave reception in radio direction finding?

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A log-periodic dipole array

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An isotropic antenna

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A circularly polarized antenna

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An Adcock antenna

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Correct answer is D