Which of the following is not a design principle for outdoor AP coverage when planning a WLAN network?

Question

Options

• ADirectional APs or antennas are recommended for roads around buildings
• BOutdoor omnidirectional antennas need to be installed horizontally
• CThe recommended installation height for outdoor directional and omnidirectional antennas is 3-5
• DOmnidirectional antenna coverage is recommended for open scenes such as squares or parks

• A
  13% (4)
• B
  77% (24)
• C
  3% (1)
• D
  6% (2)

Explanation

Option B is incorrect because outdoor omnidirectional antennas must be installed vertically (upright), not horizontally. A vertical orientation is required so the antenna's 360-degree radiation pattern spreads outward across the horizontal plane - laying it horizontal would redirect the signal upward and downward, dramatically degrading ground-level coverage.

Options A, C, and D are all valid design principles: directional antennas are indeed recommended along roads and corridors between buildings because they concentrate signal in a narrow, elongated pattern matching those environments; a 3–5 meter installation height is the standard guidance to clear obstacles while maintaining appropriate signal spread; and omnidirectional antennas suit open areas like squares and parks precisely because their all-direction coverage matches the geometry of those spaces.

Memory tip: Think of an omnidirectional antenna like a lamp post - it must stand vertically to cast light (signal) outward in all directions around it. If you knocked it horizontal, the light would shine up at the sky and down at the ground instead of out at the people nearby.

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