GetUSB.info has reported on several off-the-shelf USB extenders, but they are high priced, at least for the home user. If you have low signal strength and on a tight budget, here is a tutorial on making your own beefed up WiFi USB extender.

Using this home-brew WiFi extender will help pick up dozens more hot-spots in your area; don’t believe it – we’ll you’ll just have to try it – this really works. The premise of this solution is taking a parabolic dish and bouncing all possible waves into the focal point of the “dish” or in this case, the WiFi USB stick.
So lets break this down into 3 simple steps.
Step 1: Get the supplies
- Purchase cooking strainer from Asian food market (must be PARABOLIC)
- Some sort of handle for the strainer makes it easier to work with.
- Mesh of the strainer should be tight and consistent…don’t get loose mesh.
- USB wireless stick
- USB extension cable cord

Step 2: Build it, they will come
- Using wire snipers cut a hole in the mesh JUST the size of the USB cable.
- Squeeze the USB cable through the new hole.
- Attach the USB wireless stick to the USB cable and adjust everything so the USB stick is the focal point of the parabola.
- Now, fasten the cord into place, this is where the handle of the strainer comes in handy.

Step 3: Test and adjust
- Find your favorite access point where you have a direct line-of-site.
- Get as far away as possible to dial in the USB wireless stick while pushing the distance limit.
- Use software like NetStumbler to see the signal strength. From here, simply adjust your new wireless USB WiFi extender until you obtain the best signal you want.
- Secure the USB WiFi extender and enjoy!

Tips: You can paint the strainer to have it look more in-line with your decor, just don’t use metallic paint.
Attach the strainer to an old lamp or something which has an adjustable stand/arm; that way you can get a more professional look while maintaining the ability to adjust your USB WiFi.
Source: Instructables, these guys are great and have a lot of other unique projects. Definitely worth a visit.