Super USB WiFi Antenna At C. Crane
The Super USB WiFi Antenna available from C.Crane for $120, is touted as being able to "boost the range of your WiFi network more than one quarter mile line of sight!" 'This up to 20 dBm High-Gain range booster omni-directional antenna is probably the best home, mobile or RV WiFi antenna made. Simply install the easy software and plug the cable into your USB port on your laptop or computer and you're ready to go. The antenna has suction cups that make it easy to place for the best reception.
This is an all in one solution. Your computer does not need to have an internal WiFi card or antenna! In our test location, we only found two wireless connections with the typical 5 db antenna found on a standard router. With the Super USB WiFi Antenna we received six or seven. You can get much more distance if you want to put an additional WiFi Antenna on your router.'
Source: C. Crane