In the US, Roku offers the LiveTV app to allow live stream of local TV channels.
Would like a similar App in the UK/Europe, but focussed on DAB/DRM/DVB/digital radio (other streaming standards).
Live TV is well covered by channel streaming apps (at least in UK), and BBC radio also well served by BBC Sounds app. (Don't know if there is similar in US e.g. a Sirius channel app).
But otherwise radio is very hit and miss on Roku in Europe from independent channel apps that cover Radio. Freeview TV service in UK has good overlap with DAB/FM but not complete coverage.
App should include support for the DAB scrolling text info, and maybe Travel alerts in "wallpaper" mode or as an option to override current stream for selected stations. And DAB "video" mode (a few stations broadcast very low bandwidth video in their DAB/DVB/web stream).
Not a Roku employee