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There is an xfinity and spectrum channels just nothing for mediacom.
That's because Xfinity and Spectrum developed Roku channels for their systems and submitted them to Roku.
If you want Mediacom to have something similar, you need to badger them into creating one. Recognize, though, that if they charge you for each cable box, they may be reluctant to do anything that will allow you to cut back on the number of boxes you rent.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T