Hi @jcm48,
Thanks for posting in the Roku Community!
We're glad you're here sharing your concern about getting local channels on your Roku. Please check the details below.
Please note that you can't access local channels on the Roku streaming platform with a Roku Ultra or any other Roku player. This only works on a Roku TV. Since you have a Roku Ultra, simply connect the antenna cable to your Smart TV. You'll be able to watch local channels through your Smart TV instead of through Roku.
In addition, an "HDTV antenna" and an "OTA antenna" are the same thing. Both antennas are designed to receive high-definition digital television signals that are broadcast over the air. There is no significant difference between the two terms. They allow you to access free, local HD channels from television stations without using cable or satellite.
For more details please visit our Roku Support article: How to set up and watch cable or satellite TV on your Roku TV system
We hope you find this information helpful.
Cheers,
Riamie
Riamie D.
Roku Community Moderator