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I watch RFDTV daily. Please add the channel so I can get rid of my AT&T TV.
Roku does not develop channels for other providers. You'd have to talk to RFD-TV and ask them to create a channel for Roku devices.
Although it looks to me that they have already done so: https://channelstore.roku.com/details/6b7e2a4f306e7a0f5d23ec37b7f21775/rfd-tv-now