when buying a usb wifi dongle you need to search for two things ...
1-the chipset modes.
2-antenna extension plug (SMA-...)
1-
the 802.11 chipset wireless adapter can operate in:
Master (acting as an access point)
Managed (client, also known as station)
Ad hoc
Repeater
Mesh
Wi-Fi Direct
TDLS
Monitor mode.
2-
the external antenna plug to connect external antenna ... array of antennas etc ....
