Can I use a Linksys WRT54 router as WiFi "adapter"?

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I just moved into a 2 story duplex with my downstairs neighbor and I sharing the utilities. He's got the internet and I've got the waste utilities.
At any rate. He's broadcasting an open WiFi signal that I'm trying to connect to with my HTPC. All I have is a Linksys WRT54 series router.

Can I configure this WiFi router to pick up this signal or is it for broadcasting only? What would you call that 'recieveing-only' type of connection?

 

[Slartybart]

Nope
Different ways in setting up your Linksys wireless router

5. Cascading your router
You can extend your existing wireless network by connecting two (2) routers which are capable of sharing network resources. This process is called cascading.

With cascading routers, you can improve the performance of the network without removing your older router and isolate the network traffic. For step-by-step instructions, click here.

NOTE: Linksys routers cannot be used as wireless repeaters, bridges or media connectors. If you want to extend the signal and improve the performance of your wireless network, you will need a wireless range extender (RE1000 or RE2000) or a wireless media connector

Linksys WRT54 manual (PDF)

Why not negotiate hooking up your router to your neighbor's network? That would isolate his use of wireless from your use. Or just pick the signal - with permission.

This of course implies that your neighbor is inclined to share their resource.