The Roku devices also do not have a built in TV tuner which is required to watch OTA channels. (Other than an actual RokuTV). Normal manner is to simply connect the antenna to the same TV that your Roku device is connected to via coaxial and select the ANT Input/HDMI Input using your TV remote (not Roku Remote).
Not possible. rokus don't do over the air stuff. An HDMI port is for digital audio and video not over the air Radio frequency.
The Roku devices also do not have a built in TV tuner which is required to watch OTA channels. (Other than an actual RokuTV). Normal manner is to simply connect the antenna to the same TV that your Roku device is connected to via coaxial and select the ANT Input/HDMI Input using your TV remote (not Roku Remote).