You need to provide more information about what hardware you are using.
OTA antennas do not connect to a TV with HDMI. Sounds like you may have a separate tuner. The cable from the antenna should be a coax cable with a screw on connector. If so what is it connected to? Does you TV have a tuner? If so it should have a screw on coax connector. What does the HDMI cable to you TV connect to?
Descriptions of the hardware you’re using would help, including model numbers would be even better.
“OTA antennas do not connect to a TV with HDMI.”
Lots of OTA antennas connect with HDMI.