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G9D01

Which of the following antenna types will be most effective as a near vertical incidence skywave (NVIS) antenna for short-skip communications on 40 meters during the day?

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AA horizontal dipole placed between 1/10 and 1/4 wavelength above the ground
BA vertical dipole placed at approximately 1/2 wavelength above the ground
CA horizontal dipole placed at approximately 1/2 wavelength above the ground
DA vertical antenna placed between 1/4 and 1/2 wavelength above the ground