I use SDRTrunk to send the entire P25-Phase 2 Connecticut Digital Service to Broadcsastify's Calls Service. It uses 3 SDR receiver and each has their own antenna.
I also use it as a backup for my feed to the normal Broadcastify service for my towns Police, Fire and EMS feeds as there are times...
Possibly, or HD over coax, cat5, etc.
But the progression could have been to have TV2 (and possibly TVs 3 & 4) be in HD along with adding more tuners; both users already had "all the same options" with a Duo unit as far as usability.