What equipment reqired 2 buildings and outside?

Here is rough layout of what I need to do. This is a home network. I need wireless access in house and shop and outside. Shop is metal sided with foil insulation. Current wireless router signal in the house will not penetrate the shop. I currently have a Belkin Wireless G Plus Router an Motorola cable modem.

Belkin : Wireless G+ Router

What do I need to set this up?

Thanks in advance.