hehe... I really like the idea of that... 15db or so for $10.  Now if only I lived in an area with wifi access points. My router with dual antennaes and custum hyperwrt firmware that I can mess with the gain/boost with almost never picks up any signals where I am but I might still have to get in on this stuff cuz it's just kinda cool :)
[img:78204ebbf4]http://img235.imageshack.us/img235/9586/01425sz1i1812100ui2.jpg[/img:78204ebbf4]
I have one of those and it would just be retarded to see a big super antenna for it... it's only 802.11b though :(  Here's another, cheaper mod:
<embed src="http://www.metacafe.com/fplayer/837885/wifi_antenna_hack.swf" width="400" height="345" wmode="transparent" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash"> </embed><br><font><a href="http://www.metacafe.com/watch/837885/wifi_antenna_hack/">WIFI Antenna Hack!</a> - <a href="http://www.metacafe.com/">These bloopers are hilarious</a></font>