Q: Should I use directional WiFi antennas?

Directional WiFi antennas focus signal transmission and reception where the signal is needed most. For example, an access point (AP) in the corner of a building should have an antenna that's tuned to work in a 90-degree arc. That design provides the best signal strength to clients while avoiding transmission outside the building.

Attackers have more difficulty monitoring WiFi from outside the building if the antennas point the signal inside. Directional signals won't stop a dedicated attacker, but they'll certainly make attacks more difficult.