An RF antenna, or radio frequency antenna, is a device that is designed to transmit or receive electromagnetic waves in the radio frequency (RF) spectrum. RF antennas are commonly used in telecommunications systems to transmit and receive radio signals over long distances.

RF antennas can be classified based on the type of waves they transmit and receive, their shape, and their size. Some common types of RF antennas include dipole antennas, Yagi-Uda antennas, patch antennas, and antenna arrays. Each type of RF antenna has its own characteristics and is used for specific applications.

RF antennas are used in a variety of telecommunications systems, including cell phone networks, radio and television broadcasting, satellite communication systems, and wireless networking systems. They play a critical role in enabling the transmission and reception of data, voice, and other types of information over long distances.