In Boulder CO we have both UHF/VHF options for ABC & NBC off of Lookout Mountain and PBS on repeaters close to us. Fortunately NBC chose 9.1/9.4 for the VHF(9)/UHF(19) NBC. Unfortunately PBS 12.1, PBS 6.1, and ABC 7.1 do not have different sub channels for their different RF transmitters.
The rescanned channel list hides the unique "channel-nnnnn" numbers in the web form, so 7.1 is channel-23613 for VHF RF(7) and channel-23623 for UFH RF(17). I searched for "KMGH" in the rescan list as the rescan was running, 23613 popped up first so it was the VHF channel number. For KMGH, the VHF channel appears above the UHF channel in the "add to guide" listing. If we knew that duplicate channels in the rescan list are sorted by RF channel, we would have a clue. At a MINIMUM, we need to know if we are selecting a VHF or UHF channel when there are duplicate entries.
I'll sniff the ethernet wire during a rescan to see if I can figure out PBS and ABC.
I have a separate VHF antenna, so I can disconnect the VHF antenna from the combiner to identify VHF vs. UHF... but these channel numbers are hidden from the normal end user.
EDIT: It turns out that the channel-nnnnnn numbers are not the same when I do a "rescan". However, for my KMGH-TV 7.1 example, the RF(7) is appearing above/before the RF(17) entry for "7-1". Tablo could change this behavior, or it may be by luck that I'm seeing the rescan list in this order.