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Yeah, it's not a processor intensive task to merely tune to a frequency, and stream PIDs over an ethernet interface to another computer on ur own network. Essentially all ur doing. The pi4 is a bit more snappier in the http server department (tvhe's http server). For any sort of native playback of OTA atsc locally on the pi, I'd recommend the pi3b+ over the pi4. Any native playback of mpeg4 or higher, I'd suggest the pi4 over the pi3b+. Because the pi3b+ has built in hardware decoding of mpeg2 (OTA ATSC programs are mpeg2). Because the pi4 does not do hardware decoding of mpeg2 (they dropped that in pi4), it does do hardware decoding for hevc content. If all ur gonna do is tvhe, and playback remotely, go with the pi4, because of it's better ethernet interface, processor etc. Everything but native atsc playback, is a bit more snappier on the pi4 than the pi3b+.

There is no display "driver" specific to a distro. It's all straight from the raspberry pi people.
See the raspberrypi documentation, and / or archlinuxarm wiki documentation raspberrypi sections for any help in customizing to your specific display. Namely, look in config.txt for how best to define your display's settings and experiment... If ur primarily gonna use headless like me, maybe don't sweat it. But inquiring minds wanna know, so feel free to read the documentation and experiment.
 
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