Roku connects to your internet (Wi-Fi) and your TV. It doesn't care about your direcTV box. Just connect it to a different HDMI port.
.. and switch your TV's "Source" or "Input" setting to whichever HDMI port you wish to view at the time.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well. If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X