You are performing a wireless penetration lest and are currently looking for rogue access points in one of their large facilities. You need to select an antenna that you can setup in a building and mo

An omni-directional antenna radiates and receives equally in all directions, collecting more extraneous noise and covering a less focused area, which is suboptimal for long-term stationary monitoring of a specific zone.

A high-gain directional antenna concentrates its reception pattern toward a targeted area, maximizing sensitivity and range for detecting access points deep within a large building. Because the tester remains stationary for several days, directionality is an advantage rather than a constraint - it reduces interference from outside the monitored zone and improves the ability to detect low-power rogue APs at a distance.

Low gain combined with omni-directional provides the worst performance for a large facility, lacking both the range needed to cover distance and the focus needed to reduce interference.

Low gain limits detection range significantly in a large building; a low-gain directional antenna suits short-range point-to-point links, not extended surveillance of a wide area.