Model number of the TV and antenna would help.
The TV (if it has a tuner in it) would have an antenna or RF jack on it. Looks like a threaded cylinder with a small hole in the center. The antenna should have a connector on it that has a wire in the center that goes in the hole and then the barrel threads onto the cylinder. The position of the antenna is critical. Higher is usually better and if it is directional should point towards the TV station transmitter tower.
After you make the connection you will have to set up the TV for ova reception by have the TV scan for available channels. It won't tune in any unless you do this. How many channels you get will depend on the antenna and your location.