u/Kitchen-Tea-3214

My parents recently cancelled their cable because they finally got decent Internet to their houseand use mostly streaming services, but they still want to be able to watch the local news so they bought an antenna. The antenna they got is an indoor style and they only get reception on the other end of the house from the living room, the house already has an existing coax network so my question is, how can I tie the antenna into that network so they can watch TV in every room? The Internet is provided by their former cable company (xfinity) so I can't just go to the back of the house and swap cables around because then they won't have Internet.