i need a recomendation for a good wireless usb adaptor.

i need to pot wireless access points in 34 locations. tht director bought the stuff and then asked me. we have linksysy wireless-G (WRT54G) broadband routers, which i have no probelm but the adapters are real mickey mouse. he bought 5 to try out they are wusb854g. they loose the signal from 10 feet away. just close a flimsey hollow-core door and the connections gone.

the director seems to favor a usb solution so if anyone knows of one.....TIA