Cisco Part Number: AIR-ANT2513P4M-N= is a Cisco Aironet Four-Port Dual-Band Polarization-Diverse Antenna
Dual-band directional antenna with 4 N-type connectors. It is outdoor rated and has no cable attachments.
The AIR-ANT2513P4M-N= antennas are shipped with an articulating mount for flat surfaces and masts and is adjustable in horizontal and vertical planes. The radome is paintable using commonly available non-conductive spray paints, such as Krylon or Rust-Oleum. The antenna can operate in indoor and outdoor environments with supporting Cisco access points.
Directional antennas come in various designs and shapes, aiming to focus RF energy rather than increase signal power. By redirecting the signal from the transmitter, they concentrate more energy in a single direction while reducing it elsewhere. Higher gain in directional antennas typically narrows the angle of radiation, resulting in extended coverage distance but a limited coverage angle. Examples include patch antennas and parabolic dishes, the latter of which requires precise alignment between units due to its narrow RF path.