Your Roku needs to have a reliable internet connection, either via wired ethernet or a strong wireless connection (preferably using 802.11ac on a 5GHz bandwidth). The app does not work outside of your home network, and the Roku needs to be connected to the same local network as HDHomeRun tuner.
You will need one of the following supported HDHomeRun models to use the Roku HDHomeRun app:
To receive most ATSC 3.0 broadcasts you will need a Roku device that supports the AC-4 audio codec and the HEVC video codec. DRM-restricted channel support is being worked on and is not yet supported.
To install simply search for the HDHomeRun Channel on your Roku and install it there, or use the Roku website while logged in (app link).
To hear audio, you need a TV, AV receiver, or soundbar that can decode Dolby Digital or AC3 audio over HDMI. Most modern TVs can do this, though we’ve noticed a few Samsung TVs cannot. All Roku televisions should be able to play audio without any trouble.
Roku audio settings:
If you are still having issues: While watching live TV in the HDHomeRun app, press the * button and see if your “Volume mode” is set to “off” (this might not always be required, depending on the Roku model)