It depends on how old the TV is. If it does not have a digital channel tuner (ATSC tuner) -- https/en.wikipedia.org/wiki/ATSC_tuner then you may not get any channels.
It depends on how old the TV is. If it does not have a digital channel tuner (ATSC tuner) -- https/en.wikipedia.org/wiki/ATSC_tuner then you may not get any channels.
If it doesn't have an ATSC tuner built in then you will need a digital converter box and an antenna. Unless there are some channels that your cable provider doesn't have or you want to cut the cord you don't really need over the air TV.