I've been using an antenna for years, mainly because I receive many sub channels that dish does not carry. I found out that we didn't have to pay for locals anymore, so I dropped locals two months ago., reducing my bill by $10 If you attach the antenna co-ax to the TV 'ant.in', you use the TV remote 'input' to change to local TV You can use the TV remote to view a local program guide. [don't forget to do a channel scan]
Using an indoor antenna may cause disappointment with what channels you will or will not receive. If the transmission tower is over 5 miles distance or a hilly area or antenna not near a window, you might not get any reception. Digital is not like analog where you might get a noisy [snow] With digital, it's yes or no.