External Wi-Fi Antenna / Range extender.
These are far superior to the default "fold up sticks" you get as standard with most wi-fi cards/ motherboards.
GIGABYTE - Part No 12CR5-1ANTA2-71R, but can be used with any
network card that will accept "Male RP-SMA Connectors" Connections on
the back. (about 6mm in diameter)
These have a magnetic base for easy mounting to just about anywhere on your PC case. Stands around 12cm high.
(See my other listings for other makes and colours)