Customer Rating: 
Summary: The price is right and it does what it's supposed to
Comment: At first, I wasn't sure if I liked this little antenna or not. There isn't much to it... it's got a connector, a cord, a magnetic base (which is pretty strong by the way) and of course the antenna itself. It didn't seem to give me much of an improvement until I learned how to pick the correct location for it...
The biggest benefit of having one of these is flexibility of placement. With antennas, correct placement is crucial. I bought two: one for my desktop PC and one for my router. These antennas aren't necessarily any more sensitive than the little plastic ones that come with wifi cards and access points, but being able to move the antenna location from behind the PC on the floor (which is where most people with wireless cards have their antennas) to the top of your desk or on top of your monitor makes a big difference right away.
Now, if you are really serious about getting the best performance out of this antenna, I would suggest you download a program called NetStumbler. It will let you see the S/N ratio in dBm and it updates in real-time. This lets you get perfect placement with your antenna. You'd be amazed what a difference an inch to the left or right can make. I have a feeling a lot of people who have problems with aftermarket wifi antennas are not placing them properly.
For $5.54 each plus a couple bucks for shipping, this antenna can't be beat.
Customer Rating: 
Summary: did not work as well as I thought
Comment: I bought this product thinking I could pick up signal better where I was in a downstairs apartment, but still nothing. It was able to connect one day fine, but kept getting kicked offline. It may have just been my location. I'll try it again If I ever need it and may feel differently then.
Customer Rating: Summary: Excellent product and value
Comment: I have a Trendnet wireless G PCI card and I installed this on the desktop end as opposed to the router end. Connection went from very low and frequently dropping 4-6 times a day to very good/excellent with no drops. Ventilation ducting was in the way of where my router is and where my desktop needs to be, and luckily the antenna cord is approximately 6 feet long to accomodate placing the antenna in an higher location. I'm not sure if this actually boosts the signal but for six bucks I'm happy with its flexibility of placement, which solved my signal problem.
