I use a Linksys WUSB54G wireless adapter for wireless pentesting because the patched Linux drivers support packet injection and MAC address changing. But I wanted to get a bit more juice out of it and a few Google searches later I found this.
After spending 20 quid (inc. VAT, delivery) on wifi-antennas.co.uk, this was the end result:
 
I bought an MC male to RP-SMA female pigtail and a 9dBi 2.4Ghz wireless antenna with an RP-SMA connection for this mod.
To take apart the WUSB54G, remove the pad located in the top left hand corner of the underside. This reveals a screw and removing this will allow you to carefully open the device up.
Next, heat up your soldering iron and grab your desoldering pump and once again very carefully remove the existing antenna, making sure you don't overheat the board or bridge anything.
Now cut off the MC end of the MC male to RP-SMA female pigtail. Ensure you don't cut the cable too short. Solder the cable in place. The core should be soldered to the pad just under the large shielded chip. Solder the two large ground connections to the shielding of the cable. Once again, take care not to overheat the board or bridge anything.
The last part is to drill a hole in the WUSB54G's case for the RP-SMA connection. Keep your fingers crossed as you fire up kismet or airodump-ng.
Now you have an RP-SMA connection on your WUSB54G you could even shell out for a power booster to increase the range. Keep in mind that doing this may be illegal in some countries.
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