Thanks for the clarification. You are doing nothing wrong. If those channels are not appearing, then for whatever reason they are not being detected by the tuner scan. It could be a problem with the antenna, and it could of course be something wrong with the TV. Roku does not manufacture or support the TV hardware. TCL provides hardware support for their devices.
Depending on location and the antenna used, TV signals can be difficult to detect even when you think they should be strong. VHF and especially UHF signals are highly directional, and any sort of obstruction (terrain or buildings) can completely block the signal. Also remember that with digital TV, the signal is either there, or it's not. The term used is the "cliff effect". The picture is perfect until the signal drops to a certain level, then it's completely gone, as if it dropped off a cliff. You can't get a marginal signal with interference and still see it like you could with the old analog system.
You might try moving the TV antenna a bit and try again. As mentioned, they are very directional, so even turning the antenna a bit might make a difference. Use a site like antennaweb.org to determine what direction each TV station transmitter is from your location, as well as the distance. You might be surprised at where they are reference your location.
Dan
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee, just another user.
