I did the quick test in my hemlagenhet of how many networks wifi dongle could find.By comparison, I had my notebook Acer Aspire One, which is pretty good wifi chipset and discover many more networks than my HP laptop machine does. While your computer's built-in wifi card found 13 networks in the area, found Sandberg's wifi dongle 14 pcs. There is no overwhelming difference and the signal strength of the found networks was roughly equivalent regardless of the WiFi chip I used.
Are you looking for a real powerful wifi adapter to your laptop to connect to wireless networks in really bad conditions, this is therefore probably not the right adapter to buy.
All the better to make that case adapter on a standard desktop computer, which after all is all the more unusual with wifi support so far. According to the manufacturer to the adapter function of up to 100 meters indoors and up to 300 meters outdoors - numbers that I could not test myself because of the small apartment and a prevailing snowstorm. True figures, it is more than enough for most users.
The card supports speeds of up to 150 Mbps and support for IEEE 802.11n . Up to128-bit encryption is supported through WEP , WPA and WPA2 . Signal strength is between 13-18 dBm. The adapter costs 459 SEK to buy from the manufacturer's website.