Best way to run dsl to 2nd computer wer...

I have embarq dsl service (modem is still the one that sprint sent me) on home PC from there it is connected to LINKS router. Then to a laptop wireless.
would like to hook a 2nd home PC in a metal building not attached to the house probably about 100 ft away.
I have tried different wireless items that only work if if doors on building are open. what would be the best way to have internet to computer????
would putting a 2nd modem on the computer in building be the solution???