Which type of antenna is used in wireless communication?

An omnidirectional antenna transmits and receives radio frequency energy in a 360-degree horizontal radiation pattern, providing uniform coverage to clients located in any direction around the antenna. This characteristic makes it the default choice for wireless LAN access points where the goal is to serve multiple clients distributed throughout an area. It is the most widely deployed antenna type in standard enterprise and consumer Wi-Fi infrastructure.

A parabolic dish antenna is a highly directional, high-gain antenna designed for long-distance point-to-point links and is not suitable for general multi-client wireless coverage.

A unidirectional antenna concentrates its signal energy in a single direction, making it appropriate only for specific point-to-point or sector coverage use cases rather than broad area wireless communication.

Bi-directional is not a recognized standard antenna classification in wireless networking - antennas are classified by their radiation pattern shape, not by how many communication directions they support.