Sporadic network connection

This weekend I moved my eMac upstairs and left the router downstairs w/ my server. When I had the Mac and server together, they were networked via Ethernet through the wireless router. Now that the Mac connects wirelessly, I don't have a good connection to my server.
The server is for web development and runs Gentoo Linux. The wireless router is a D-Link DI-624. When using Ethernet, I had no problems; I could ssh into my server without any problems. But since I'm going wireless, the connection times out when I try to connect.
If I reboot the Mac I can get an initial login but can't seem to maintain it. For example, if I open up a program remotely then minimize it, when I go to maximize it the window is blank. The X11 terminal window also won't take any commands because the cursor won't move.
If I let the Mac go to sleep, I can't login without rebooting. Besides not being able to login via ssh, when the server stops responding to me, it also prevents me from accessing Apache and doing any web design.
I have no problems connecting to the Internet and the only thing that is different is the wireless connection. I have WEP 128bit enabled but SSID broadcast is disabled for additional security. All current Apple updates have been applied and the router has the most recent firmware.

I don't assume the airport card is causing the problem.
Are the iBooks all placed from the same distance to the Wireless accesspoint? Try putting the "troubled" iBook in the exact spot of a "trouble free" iBook and check connection health. That way we can exclude that the problem is caused by some device in the house interfering or just the distance to the accesspoint. When you are too far away your signal becomes low and sporadic loss of connection can be the result.
-Magnus

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