There are a couple of ways you can watch free, live TV channels on your Roku device without a cable or satellite provider or monthly subscription to streaming apps. The Roku platform itself offers support for the Pluto TV app, which offers free, live news, sports, and entertainment channels via a dedicated app. However, since it is a web-based streaming app, you'll need a Wi-Fi or Ethernet connection to use Pluto TV.  If you don't have reliable access to an internet connection for streaming online content, all TVs are built with an internal digital antenna for picking up over-the-air (OTA) TV channel signals, which are also free to access. But do be aware that depending on where you live and how your house is built, you may need to invest in an indoor or outdoor TV antenna to boost your TV's ability to pick up a strong, steady channel signal.