Tom,
If I'm not mistaken, your Netgear box has a detatchable antenna? If
so, you might benefit by replacing it with an Omni gain antenna. I
bought one of these 5.5 dBi antenna's from Pac Wireless:
http://www.pacwireless.com/products/PAWIN24-5RD.shtml
I saw an improvement from an access point that went from a 6 to a 19
RSSI. About $25 with shipping.
Failing that idea, D-Link has some AP boxes that can be configured as
repeaters. I think the DWL-900AP+ can be had for around $40. Then
there's the DWL-2100AP. More money, but many more modes of operation.
Chet