Samsung built in antenna?

I have what I think is Q95D OLED. I never hooked up an antenna to it. There was a 3 inch antenna that came with that I thought was for blue tooth. I am getting local over the air channels when I go to “live tv - air” app. Is that small antenna stick was is giving me these channels? Or is there a built in tuner? I have never had these channels on a tv without an external purchased antenna. I have a pair of rabbit ears on my other tv that I constantly have to adjust so idk how this little stick could be so powerful.