No the 4K feed is not available OTA. Fyi in 2020 when they did this before, the 4K upscaled feed was significantly better than the OTA 720p feed. They do have 4K cameras and recording in 1080p HDR which makes a big difference.
You mentioned Ethernet cable, but will you be out of wifi range? If it's not too far from the house (and depending on your wifi setup, obviously) that might still work.
takeitsweazy t1_j89v20u wrote
I’m pretty sure that over the air broadcasts picked up by antennas are in 1080.