If not how do I get to see live tv. Would love to cut cord.
You will need a Plex approved tuner to connect to your network, such as those offered by HDHomeRun. I believe you need to set up the DVR in Plex anyway to use the Live TV part of the service. It ties to tuning the channels and providing the guide.
You need a tv tuner, or what Plex calls a “dvr tuner”. See this list here: https://support.plex.tv/hc/en-us/articles/225877427-Supported-DVR-Tuners-and-Antennas
The DVR tuner gets you two things: live tv and the ability to record and play recordings.
If ll you want is OTA free live tv then plug the antenna into your tv and scan for channels. if you want to watch it on tablets, phones computers and tv from inside your home network then get a hdhomerun extend and use their apps. If you want to watch on those devices outside your home network setup that same hdhomerun in plex dvr.