Which aspect is most important to note when a semidirectional antenna is used to ensure coverage and security?

• A. The antenna color and branding.
• B. The antenna orientation along with the side and back lobes.
• C. The warranty terms.
• D. The length of the feeder cable.

Answer: (B)

Semidirectional antennas work by directing most of the transmitted energy toward a specific direction. To get reliable coverage and keep the signal from leaking where you don’t want it, you must correctly orient the antenna so the main lobe points toward the intended coverage area. The side and back lobes are weaker streams of radiation in other directions, and if the antenna isn’t aimed properly or if these lobes are strong, you can create coverage gaps and expose the network to interference or potential eavesdropping outside the desired area.

In practice, this means aligning the antenna for the target zone, considering obstacles and reflections, and possibly adjusting tilt or elevation to optimize the line-of-sight and Fresnel zone. While other factors like feeder cable length can affect signal loss and overall performance, the key factor for maximizing coverage and tightening security is the controlled directionality given by the antenna’s orientation and its lobes.