A friend of mine wants to connect up to his daughter and son-inlaw's DSL. They live in a mobile home about 100 to 150 feet away. they have a Actiontec wireless DSL modem and gateway model GT701-WG. He has a fairly new DELL laptop (corporate model) with WIFI built in. He can logon to it if he is inside their mobile home (aluminum) but not from his house. Any sugestions on how he can extend their range?