I’m guessing you have a Roku TV and are asking about using Over-The-Air vs Wi-Fi. When streaming, it will be using the Wi-Fi antenna (or ethernet if you connect it that way), and when viewing OTA TV, will be using the OTA antenna. When viewing OTA, there may still be a little background internet activity, like checking for firmware updates, but the picture/sound you are watching will be arriving Over-The-Air from the local broadcaster.
@Bruce3241 you need to be more specific about what you're asking. What model Roku are you using? Referencing a "digital" antenna (there's no such thing, and antenna is an antenna) sounds like you're referring to a Roku TV, not a player. But without additional information, we're all just guessing about what your issue might be.
The only Roku player with an external antenna is the Roku Stick, which has the WiFi antenna built into the power cable. This allows it to be larger and work better.
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Let's ensure the system is updated to its latest version. I suggest you follow the troubleshooting steps mentioned below:
-Restart the system by navigating to Settings->System->Power->System restart -Update the system by navigating to Settings->System->System update->Check now -Select Settings followed by System -Select Zipcode and enter your zip code -After you enter your zip code, you need to set up the Live TV input again and let your Roku TV re-scan the "over-the-air" channels. -Navigate to Home, and select Live TV. If Live TV is missing, you can add it by going to Settings > TV inputs > Live TV > Set up input -Follow the instructions on the TV screen to complete the setup