Powerful, directional antennas like this are ideal for reaching long distances - but only in one specific direction. This makes them great for use on a computer that needs to communicate with a router a long distance away, but not ideal for use on routers themselves since they generally need to communicate with devices in many different directions.
Model: Asus WL-ANT-157
Applications: Wireless LAN IP & Router & PCI/PCIe Adapter with R-SMA Connector
Frequency Range: 2.4GHz/5GHz
Gain: 5dBi & 7dBi
VSWR: 2:1 Max.
Polarization: Linear, vertical
HPBW: HPBW/horizontal 70‹/50‹, HPBW/vertical 70‹/60‹
Impedance: 50 Ohms
Connector: RP SMA PLUG