An alternate method I've used is building an antenna on the computer side if you can't build it on the router side. You can get wireless adapters which are in t

An alternate method I've used is building an antenna on the computer side if you can't build it on the router side. You can get wireless adapters which are in the from of a usb thumb stick. Coupled with an extension cord to connect to a PC, you can put the entire adapter at the focal point of a large dish.