There are a number of local TV stations have their own channel available in the Roku channel store, while other stations are available through the private channel, NowhereTV. The website RokuGuide.com keeps an unofficial listing of local channels available on Roku.
RokuGuide.com is organized by state and lists whether the local station has its own channel on the Roku channel store or if it can be accessed through NowhereTV. NowhereTV is not in the Roku channel store, but it is available for free from the website thenowhereman.com. A Roku user will need to provide a Roku username and password to download the channel to their Roku device. An additional system update may be required on the Roku to complete the download of NowhereTV.