Originally Posted by Thorn

The DWL-G730AP is a will not do what you want it to do. You want it to act as a repeater, which it's firmware does not support.

Buy an AP that has a repeater mode", and make sure you get one with external antennae that are removable. That way you can easily replace the antennae with high-gain units if you are getting an insufficient signal.

*DLink units that have repeater mode:
DWL-G710 - High Speed 2.4GHz (802.11g) Wireless Range Extender
DWL-7200AP - Tri-Mode Dualband 802.11a/b/g (2.4/5GHz) Wireless 108Mbps Access Point with PoE
DWL-2200AP - High Speed 2.4GHz (802.11g) Wireless 108Mbps Access Point With PoE
DWL-2100AP - High Speed 2.4GHz (802.11g) Wireless 108Mbps Access Point