We now have in stock and ready to ship 500mW pen booster amplifiers for 802.11g wireless equipment. Our boosters have both an RP-SMA male and RP-SMA female connector, so you can immediately install them in between your existing WiFi adapter and antenna (use requires a WiFi adapter that has an RP-SMA external antenna connector).
The kit also includes a converter to RP-TNC if you want to use the device with your wireless router instead. These pen boosters are compatible with all types of USB and PCI WiFi adapters, including the very popular Alfa AWUS036H 500mW USB adapter. When using with the Alfa adapter, you can boost your total max output power up to 1000mW, that's one full watt!
Check out the item description we have for this product, we have a nice comparison graphic showing WiFi range with the AWUS036H adapter and a 2 dBi gain antenna compared to the same setup using this 500mW booster. It gave quite a range boost.