This phenomenon is called a repeater. Most SOHO (small office
home office) boxes will function in the repeater mode.
However, I suggest getting one decent access point (cisco)
instead of two or three cheap access points.
Cisco AP 1200 on Ebay with 9dB omni antenna is about $450
I have a 35mW AP thats giving me 70% power levels at nearly 60 feet.
11Mb/s throughout my 8300 Sq Foot office.
The Cisco will do much better with that external Omni antenna.
Get a decent PC card too.... Netgear WAG511 is very good for
it's price $85
Mike
www.Netopsed.com