Radio Amateur Quiz Canadian License

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Question A-007-007-005

When a half-wave dipole antenna is installed one-half wavelength above ground, the:

Correct Answer

vertical or upward radiation is effectively cancelled

Explanation

A horizontal dipole at one-half wavelength above ground has a null in its radiation pattern directly upwards (at 90 degrees elevation) due to cancellation from the ground reflection, and its main lobe is at a lower angle.

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