I am also fairly new but fumbled on a site of interest. The info may help you decide what to do.
http://kyleti.aswwc.net/index.php?pa...80211b_Discone
I am building a version of the disc-cone for myself. I will post results but am waiting for the pigtail for my card before I can try anything.
This is all assuming that your computer wifi card has an external antenna jack.