That repack for a channel 2 - 29 sounds a little crazy. I figured a repack up to channel 36 was something that was going to be more realistic. We'll see what happens. There will be a new government in place by the end of this year in DC.
Some of this repack can be done though.
Some companies own two stations in markets. Example, in Ottawa, Bell owns CJOH (13) & CHRO (43), RNC owns CHOT (40), CFGS (34), and CBC/SRC own CBOT (25) & CBOFT (9 & 33), plus Rogers owns three (17, 20, 27). All those entities should be forced into owning one physical channel. And all can offer two streams of 720p with little to no problem. When ATSC 3.0 gets put into place, I'm sure they can get that back up to 1080i for each stream.
CJOH (13.1 - CTV, 13.2 - CTVtwo) rf13
CBOT (9.1 - CBC, 9.2 - SRC) rf9
CHOT (40.1 - TVA, 40.2 - V) rf 34 or 40 for now
CFMT (20.1 - Omni 1, 20.2 - Omni 2) rf20
Plus analog re-transmitters that effect digital signals such as CJOH 8 Cornwall should be shutdown I'm sure it screws up rf9 in Ottawa, and rf7 in Watertwon, NY
Some stations have a operations agreements in the US. In the Burlington - Plattsburgh market WVNY (22.1 - rf13), and WFFF (44.1 - rf43) have an agreement. Basically WFFF runs WVNY. Local news etc. Sorry, that actually is one station.
Somebody will have to sell one to the other, or do a stock swap of some sort so that it's actually 1 station with streams (44.1 - Fox, 44.2 - ABC)
Channel Master CM4228HD, CM3414, DVR+, Sharp AQUOS