https://www.ameclat.com/product/tp-link-2-4ghz-3dbi-wireless-n-desktop-antenna-tl-ant2403n/

3dBi Omni directional gain boosts your wireless signal RP-SMA connector works with nearly all the wireless routers / adapters No software required, simply plug and play Compatible with 802.11n products What This Product Does Wireless N Desktop Antenna TL-ANT2403N operates in the 2.4GHz band and provides 3dBi omni directional operation, to extend the wireless range. The antenna offers three RP-SMA female connectors, which could effectively connect with all the 3T3R routers, access points or adapters to upgrade the wireless performance. Also, the desktop design and the bundled lowloss cable ensure its flexible deployment and stable signal.