Wifi repeater

Omni round 360 degree antenna mounted outside your building on the house side. Cable that into the building into a USB wifi adapter and plug that into a laptop or desktop computer.

That will get you online for one computer in the garage. Like a big catcher's mitt catching the wifi signal from the house.

Want to wifi the whole garage for phones and wifi capable laptops, that's going to take some more technical doing.

Trenching in the underground Cat 6 cable into the garage and plugging that into another wifi router in the garage will give you full wifi in the garage. 325 feet maximum distance between house router that is the source and the garage router that will be re-broadcasting the signal.

Yes they make repeaters, but lots more technical and you are trying to push the wifi through the metal building.

Can look up DD-WRT linksys converted wifi routers that have the Linux Firrmware upgrade and aftermarket cooling heat sink built into them for the added broacast power, are adjustable and can crank them up to 250 . . .

These are some of my favorite routers, you can push signals with larger antennas and catch the signals with larger antennas. Takes soneone that knows how to set up the standard routers with wifi security SSID, your signal name.

Kind of a pet peeve to see how far we could push a signal. Pushed a line of sight signal 5 miles with special send and recieve antennas. Also used some of the same to send wifi though a small town, can get a little spotty getting zeroed in on the signal. Did this all with the DD-WRT routers.

Like I say it gets more and more technically challenging the more distance you try and push, and reliability goes down the farther away from the source you get.