|You could use an old computer in the garage and connect it to your antenna and then in turn to a Cat5 cable to the house.|
Also, there are antenna's that are network capable. They'd likely be a little more expensive, but you could connect the Cat5 cable directly to it after setting the antenna up. Plug the other end of it (in the house) into a SOHO router (best way to go) or directly into your PC.
If you buy a wireless capable SOHO Router, you could provide internet to your whole house via wired and wireless........as compared to plugging directly into one PC and that's the only one able to access the internet.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.