Go to
https://www.antennaweb.org/Address and enter your address, it will tell you what channels you can receive. It will also tell you what kind of antenna you would need, where to point it (if directional,) etc.
By and large, you would be limited to the "big three" networks ABC, CBS, NBC, plus Fox (local affiliate Fox, that airs The Simpsons, not Fox News,) a local PBS station, and probably an independent or two.
You can also visit the "List of local TV stations in..." Wikipedia page for your local area:
https://en.wikipedia.org/wiki/List_of_television_stations_in_ (Add your state on the end.) It appears you're in New York, so yours would be
https://en.wikipedia.org/wiki/List_of_television_stations_in_New_York
Digital broadcasting allows multiple signals per "channel," usually written as x.y (such as 8.1, 8.2, 8.3, 10.1, 10.2.) Many local broadcast channels will put their main network on the x.1, and have some other station (the "reruns of classic TV shows" MeTV network, for example,) on the x.2 or more. My local PBS does "main programming" on the .1, "extra programming" on .2, and a simulcast of their radio station on .3 (with the weather forecast as the visual.)
There is the EyeTV/SiliconDust HDHomeRun tuning device that you connect to an antenna and to your network, and lets you watch live broadcast TV on up to two devices at a time. (Mac, iOS, Apple TV, etc.) That's what I have, and it works great. (Although I only use it for Mac and iOS.)
