Using the "inSSIDer" tool, this antenna ranked equally with the built-in antenna in my IBM Thinkpad T60 listed a -35dbm antenna signal in the same room as the top-of-the-line DLink 300 "N" class WiFi router.However outside, in my car placed this unit on the dashboard, and I was picking up signals from blocks and blocks away.I purchased a 15' USB extension cord to use this, but the signal is not strong enough for the unit to work using the extension.The cord is reasonably long enough, and the full-sized USB connector to your computer is durable given that I've already bumped this connector numerous times.Product design enhancement would be nice if the USB plug mounted flush with the grommet for the wire.  The USB cable sticks out pretty rigidly before the grommet allows the cable to flex around.. 

Question: How is the capability?
Answer: this antenna ranked equally with the built