Question about Linksys WSB24 Wireless Booster

There is a review on the Linksys WSB24 Wireless Signal Booster on Tom's site, but I am curious about something he says at the end of the review. He says as far as range expansion is concerned, the booster really doesn't do that. But, if you "Pair it up with the hot 802.11b radio in an Atheros-based dual-band client card (such as Linksys' WPC51AB) though, and whoo Mama, then you'll be talkin' range expansion". I checked out the WPC51AB, and it is just a A+B PC Card. How is using this card going to increase the range? I have a Linksys WPC11, how different would the range be between these two cards? You can find his review here: http://www6.tomshardware.com/netwo [...] ss-07.html Thanks for the help.