The TP-Link Archer C7 AC1750 Wi-Fi router comes equipped with six total antennas, three of which are external and replaceable. Using the common RP-SMA standard connection type, the antennas on the back of the router can be unscrewed and replaced with a third party option. Most of the time, a router can be moved to a better area to improve signal, but sometime there is no better option and more gain is needed. The HUACAM WiFi Antenna Dual Band has a strong signal up to 10dbi and supports both 2.4Ghz and 5Ghz frequencies. This is one of the best antennas you can add to your router without being too bulky.
Full story from the WindowsCentral blog...