Live TV on The Roku Channel "varies by location".
Live TV Guide (for streaming channels) is only available in the US, as specific licensing/distribution/carriage agreements restrict all of it.
https://support.roku.com/article/115012658287
Notes:
- Using Live TV Channel Guide to find live streaming TV listings is only supported in the United States. Using it to find "over-the-air" TV listings is supported in the United Kingdom and the United States.
- Your Roku device must be connected to your network and the internet for Live TV Channel Guide to help you find live streaming TV listings. Without the connection, Live TV Channel Guide will also not display detailed information about "over-the-air" programs, but you can still view a basic channel list.
- Live TV Channel Guide is not available for your cable TV subscription. This includes the connection from a set-top box, or a direct connection to the Live TV input (on your Roku TV).