Just like days of old you have an antenna connection run to the TV. Not much new needed here and it can be cheap and easy to use.
As to tech solutions for TV channels, the Sling Box and such may be next.
I purchased a Samsung Smart TV for upstairs. I have a similar TV in the basement with a Roku. I have no coaxial connections upstairs. I use the Smart TV upstairs for Netflix/Amazon. However, I was wondering if there was any way to connect some sort of antenna or other viewing device, perhaps with a wifi or USB connection, that will allow me to watch TV channels. The Roku needs a wired ethernet connection, which is also in the basement, so that won't work.