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Hi Foxbat,
I apparently haven't checked in on this forum in the past few weeks, as I'm only today seeing your post about Northern Michigan. I grew up near Cadillac, and as an OTA geek have set up TV antennas for two households by Charlevoix.
Did WGTU (29) and WPBN (RF 35, vc 7.n) ever start coming in at your family vacation home? They've been on the air throughout the month, both per logging on the RabbitEars Live Bandscan (I've even had WPBN reach my HDHR tuner under ideal conditions, and I'm 110 miles south), and the fact that my Charlevoix family and friend haven't asked me about not receiving ABC and NBC.
If they didn't come through for you at all, one small thought I had is maybe there needs to be a new LTE filter added at your location. Perhaps T-Mobile has lit up on a close-by tower and is swamping the tuner (especially if you have a pre-amp or amp inline) ... but you likely already have considered that since early August.
If you're still "Up North", what's been added as the new 45-7 subchannel? I see today that Trip has it noted in the WFUP listing, but neither he nor anyone editing Wikipedia have cited the content. My guess is that it's a shopping channel or maybe Grit (since WWTV 9 added Grit a few weeks ago). Not that you receive WWTV 9, but I see RabbitEars has a 9-7 noted as coming soon.
Shopping comes to mind readily, as where I'm at in the Grand Rapids/West Michigan market, WXMI (RF19) added 17.6 ShopLC last week. 3 Full Service/Full Power stations here now have ShopLC.
Those upcoming ATSC 3.0 stations are for the Evoca Michigan market--Info.:
The smart, simple way to watch TV! and
Evoca Launches in Northern Michigan - 9 & 10 News .
Cheers! ~~ Statmanmi