Summary: I'm an IT consultant (25 years now). I installed this on my mom’s wireless USB NIC. Before swapping out the antenna she would only get 1 or 2 bars and connect at 5 Mbps. After putting on this antenna she would get all 5 bars and connected at 54 Mbps. The speed increase was very noticeable when just surfing the web. I'm so happy with it that I've decided to get 4 more of them, 2 for my router, one for my laptop and one for my desktop.
Summary: I bought 3 of these antennas to attach to my TP-Link router. There's a small improvement in signal strength when I test at a short distance from the router (1-3 meters). At a short distance it goes from -40+ dBm to -30+ dBm. The change is even smaller at a greater distance (10+ m). I expected a greater improvement going from 3 x 3 dbi antennas to 3 x 8 dbi. Good thing that I pricematched and didn't spend too much money.
Summary: Good cheap upgrade for any wifi device. Bought it to replace the onboard wifi antenna on a Zotac ITX board. Range and signal quality is improved. This is no compact antenna, it looks smaller in the picture that it actually is. I wanted to hide it behind the small ITX PC case but it actually sticks up a couple inches above the case. Does not work with WRT54GL routers, the connector is different but there are adapters you can get.
Summary: This antenna does extend my wi-fi range so that my ability to connect to the internet covers all 2.5 acres of my property. The only area not covered is where there are dense woods. I expected this outcome from reading about any wi-fi range extender.