Since you need to connect your Roku to some sort of display, and in almost every case that display is a TV with a tuner, why bother with a tuner within the Roku player? There's zero value in a tuner within the Roku player when the display already has one.
For the rare times someone is using a computer monitor for the Roku display, then there is a need for a tuner. However, there are many available tuners on the market already. Here's one example at Amazon for $30. There's also a number of tuners made by Silicon Dust that connect to your network and can be accessed on a Roku. Don't forget that in North America they are in the early stages of the next version of digital broadcast TV, called ATSC 3.0. Silicon Dust is the only maker of a 3.0 tuner at this time, with the HDHomeRun Flex 4K. I have one on my network. There's a channel for Roku devices that works just fine for any of their networked tuners.
Dan
Roku Community Streaming Expert
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