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DVI will just carry the picture, HDMI will carry picture and sound. Most monitors have a HDMI on the back and some small speakers built in. I recently did similar, got a now tv hd smart box and just plugged it into the extra port.
I'm using this box, make sure to cancel the subscription it wants you into.
https://www.maplin.co.uk/p/now-tv-smart-freeview-box-3-month-entertainment-bundle-a39yj
No idea, I'm completely clueless in this regard: I haven't had a TV since before digital.
The channel is Talking Pictures TV.
I've got DVI, not sure about HDMI.
So the tuner just plugs into the monitor, rather than the PC? Sounds more straightforward than I thought.