Internet to detached garage/office

Hello, I am trying to get internet from my house to a garage/office I have about 70 feet from my house.  I only subscribe to xfinity internet service in the house and have a XFi Gateway (router/modem) and one Pod extender installed there.  I tested the Pod at the garage and do not get enough WIFI signal for zoom calls.  I only have coax cable running to the garage.  From previous posts I have read looks like I am out of luck.  Anyone have some thoughts on this?  Thanks!