ROKU TV only showing SOME over the air channels

Hi, mabez.

We appreciate you reaching us here in the Roku Community!

We'd be happy to provide you with some steps you can try about having issues with the over-the-air channels.

In this case, depending on where you live, you may be able to receive free “over-the-air” TV broadcasts from nearby TV stations using an HDTV antenna. 

To access “over-the-air” broadcast television, the HDTV antenna must be connected to the Live TV input of your TV.

1. Connect the coaxial cable from your HDTV antenna to the “Ant/Cable In” connector on the back of your TV
2. Press Home Button on your Roku remote
3. Select Live TV
4. Follow the instructions on the TV screen to complete the setup

You may also visit this support article on how to set up and watch live TV on your Roku TV system

If you need further clarification and assistance, please don't hesitate to let us know.

Regards,
Reynan