Wireless Network Antenna

Long live the Life After 208 revival!

A question for Dan and Joe this time:
I've got this terrible wireless network at home that's annoying as h due to a mysterious forcefield in my bathroom that won't allow wireless signals to pass through. Because of that I'm using a repeater station to bounce a signal around the bathroom to Maria's computer. That little signal repeater has thwarted every attempt I've made to secure my network via password, so I've locked it down through MAC address and limiting the number of IPs the DHCP server will give out. That works fine most of the time, but when I want to use another device for a while, or a friend brings over a laptop or whatever, I have to go change settings on my router to serve up an IP. So I'd like to just lock things down with a password and get rid of that headache.

What I think would really fix this is some sort of antenna extension for Maria's wireless card (it's a PCI card with the screw-in antenna sticking out the back). If I could just get a cable that would let me mount the cable around the corner so it had a clear path to the wireless router I think we'd be set. Can I get some sort of cable that'll connect the antenna to the PCI card, allowing me to mount it remotely?