I bought with 3x 2dbi antennas TP-Link a Wlankarte (PCIe) and realized that I despite 4-5 meters to the router had little more than a line in the Wi-Fi connection. Then I have this antenna by CSL with 9dbi ordered equal to 2 times -> with a connected antenna there were 3 strokes and with two then finally the full link quality (116 Mb).
The only drawback to the antennas: they are extremely large and have relatively short cable (fit just so on my desk)