I checked the dataset for your TV and I don't see any discrete input commands.
Does the "InputNext" command in device mode behaves the same way?
Can you go to the Antenna input when you press a number and/or the channel up/down button?

If the "InputNext" command (in device mode) does not cycle to the Antenna input, but you can get to the antenna input by pressing a number and/or the channel up/down button, then you will have to add a clone TV with a single input - Antenna. Turn off the clone power control by setting its power configuration to "no power buttons" - The main TV device will control the power so it will need to participate to all activities using the TV device.

For the main TV device, if the "InputNext" command in device mode has to be sent twice before it cycles to the next input, then you will have to use the default Adjust Input Method 3. However, the default is missing the Antenna Input. Add it and move it to very top because that it's the TV power on default stating point. Also make sure the other inputs are the in correct order and answer the 3 questions correctly (tell it what the TV does - not what you wish it did). Also check if you need the 3rd confirm command. The default is set to "InputNext". You may need a different one. If you don't need the 3rd command, then just select -None-.