one of the things I often do, is use the wifes windows machine with a DONGLE either pccard or wifi dongle, to GET the signal, THEN I'll use ICS (internet connection sharing) on that same laptop to share the DONGEL WIFI connection with the built in WIFI connection. Or, sometimes I will share it with the pc ethernet connection and then connect that to a travel router. There are a lot of options,

First question to answer is, do I get enough signal to share, if not must go to distance antenna solution, if YES, then there are a lot of options for getting and repeating.