Didn't do much,
Verified Purchase(What is this?)
This review is from: TP-Link TL-WN722NC 150Mbps High Gain Wireless USB Adapter (Accessory)
Gave a slight improvement to signal, but nothing much, and probably only because of the cable length allowing me to put the adapter 1/2 a meter closer to router. If you're computer's wifi receiver is rubbish than this may be a good investment, but if it already has a decent one then don't expect this to make a great deal of difference. Also, it although it worked OK with my PC, it doesn't work with my Mac - no driver available.