Joking aside: not exactly the kind of antenna you'll find in off the shelf wifi equipment.
*waits for wraper to dig up an off the shelf piece of wifi equipment that has this antenna*
Of course you can find good, reasonable and crappy antennas. I remember some antennas I tested a couple of years ago. Granted, they were cheap despite being attached to an (COUGH!)"N"(COUGH!) (*) connector, and the "radiating element" was just a more or less random piece of wire inside a plastic piece.
I tested 20 of them with a VNA and there were no two equals. But fine, the person who asked me to try them told me the cost was a hefty dollar a piece or so. These antennas were sold as "3G antenna" and they are all part of the same batch. Out of 20 I think that maybe 5 didn't even have a piece of wire inside.
This is more or less the equivalent of the fake ferrite suppressor you find in bottom of the barrel USB cables. Just a cylinder of plastic.
Note for the curious, that awesome VNA is not mine, it's at the University. My own VNA is cheaper than that VNA's calibration kit.
(*) The cough is due to the fact that the connectors were N compatible (you could plug them!) but they were more like a copy of an N connector. The quality of the centre ring was apalling.