Alright so I recommended this one:
http://www.tigerdirect.com/applicati...rkey=E399-1009 because I think if he gets a usable signal at all with the internal laptop card, almost any external antenna will be good enough. It's not b/g/n but does anyone ever use b at all anyway??
Then here's this which is better, but I think he may have problems installing the god damned thing..
http://www.newegg.com/Product/Produc...9SIA1AZ0DT6543 but it's supposed to be very powerful AND sensitive