CompTIA Network+ (N10-009)Network ImplementationMedium
A wireless engineer is deploying an access point to cover a long, narrow warehouse aisle and wants to concentrate the RF signal down the length of the aisle rather than spreading it in all directions. Which antenna type should be used?
- AIsotropic reference antenna
- BRubber duck antenna
- CYagi directional antenna
- DOmnidirectional dipole antenna
Show answer & explanationAnswer & explanation
Correct answer: C. Yagi directional antenna
A Yagi antenna is a high-gain directional antenna that focuses RF energy in a narrow beam, making it ideal for covering long, narrow spaces such as warehouse aisles or hallways.
Why the other options are wrong
- A. An isotropic antenna is a theoretical reference point, not a real deployable antenna.
- B. A rubber duck antenna is a small omnidirectional antenna commonly used on APs, not directional.
- D. Omnidirectional antennas radiate signal equally in all horizontal directions, wasting energy outside the aisle.
Directional (Yagi) Antenna
An antenna design that concentrates RF energy into a focused beam, providing higher gain in one direction, useful for point-to-point or long narrow coverage areas.
- Contrasts with omnidirectional antennas that spread signal 360°
- Common uses: hallways, warehouse aisles, point-to-point bridges
- Higher gain in one direction means less coverage elsewhere
Memory trick: Yagi = flashlight beam; Omni = light bulb.