Read the Amazon 'one star' reviews and believe them for a change. This adapter has a serious driver problem (Media Tek/Ralink based). Throughput fluctuates from the ballpark 150Mbps you'd expect to see down to 1Mbps, at which point you will wonder why pages are loading so slowly, check your router status and then realize that it's this adapter. All in all a disappointing product from Netgear ... it looks pretty but doesn't work very well. Sorry, something like this should just work straight out of the box. I don't have time for faffing (well, I do, obviously!). Oh, and even in standalone-installation mode Netgear still drops a program in Startup which 'phones home', ostensibly to check for driver updates. I tried to extract the drivers-only using 7-Zip but it didn't work out. Post-install, I copied the Drivers folder (7 files) to a removable drive and then reinstalled Windows from a recent Acronis image. Those 7 files seem to be all you need. 3 stars because, as always, maybe I'm the problem; I'm testing at a distance of less than 5 metres from the TP-Link VR400 router so there's always a possibility that the signal is too strong (is that a thing?).
[And the antenna is not detachable, except in the sense that there are 2 small screws securing it that will need a jeweller's screwdriver ... and who knows what happens after you've unscrewed them.]