A dual antenna is an antenna that combines both horizontal and vertical polarization in one device. This type of antenna allows simultaneous transmission and reception of signals in both polarizations, which increases the stability and reliability of WiFi connections. Dual antennas are often used in modern WiFi systems, such as MIMO (Multiple Input Multiple Output) technologies that increase data throughput and signal range. The ability to work with different polarizations makes dual antennas suitable for demanding network applications and high-density environments.