An administrator wants to establish a WiFi network using a high gain directional antenna with a narrow radiation pattern to connect two buildings separated by a very long distance. Which of the…

A dipole antenna is omnidirectional (radiates in all horizontal directions) and has relatively low gain, making it unsuitable for focused long-distance point-to-point links.

The Yagi-Uda antenna focuses radio frequency energy into a very narrow beam, concentrating signal strength in a single direction to achieve high gain over long distances. Its narrow radiation pattern minimizes interference and signal loss that would otherwise degrade a long-distance link. This directional focus makes it ideal for fixed point-to-point connections such as building-to-building wireless bridges.

Sector antennas cover a wide horizontal arc (typically 60-120 degrees) and are used in cell-like deployments to serve multiple clients in a broad area, not for narrow long-distance point-to-point links.

Omnidirectional antennas radiate equally in all directions, dispersing signal power rather than concentrating it, which is insufficient for achieving the gain needed over a very long distance.