The omnidirectional antenna is shown as () degrees on the horizontal direction diagram.

Question

Options

• A90
• B180
• C360
• D0

• A
  11% (4)
• B
  6% (2)
• C
  80% (28)
• D
  3% (1)

Explanation

Option C (360 degrees) is correct because an omnidirectional antenna radiates energy equally in all horizontal directions, forming a complete circle around the antenna - and a full circle spans exactly 360 degrees. The word "omnidirectional" comes from the Latin "omni," meaning "all," which directly signals full horizontal coverage with no preferred direction.

Option A (90 degrees) is wrong because that describes a sector antenna covering only one quadrant, commonly used in cellular base stations to serve a limited arc. Option B (180 degrees) is wrong because that would represent a hemidirectional or cardioid pattern, covering only half the horizontal plane. Option D (0 degrees) is nonsensical as a radiation angle - it would imply no coverage at all.

Memory tip: Think of "omni" as meaning "all around the clock" - a clock face is a circle, and a circle is 360 degrees, so an omnidirectional antenna always equals 360.

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