Please clarify. I assume that as there is no cable or phone connection to the land you are using cellular phone technology broadband via the modem stick.
If so, I believe you can get cellular-type modem/routers with which you can relay the broadband to other computers via wifi.
I would guess that otherwise, you will have to set up Windows Internet Connection Sharing via the laptop. ICS is a bit flaky so I suspect that using a wifi network with it may be a little messy.