If you live close enough to a broadcast tower, you can actually install an antenna indoors. However, if that doesn't work, you will have to install an antenna outdoors on your roof. Since antenna installation outdoors involve heights, we recommend hiring a home service pro.
We had a store that we knew and worked with a few times over many years install a sound system into our newly renovated family room. It all worked and then we changed providers of internet and tv programming...
Bill made suggestions and recommendations, did the wiring and all installation and provided ongoing follow-up support and service until I was totally familiar with my system. Would highly recommend him to anyone looking for a high quality AV system.