I can tell you that at that distance, mobile will not be likely. I don't know where you've been reading, but I've never seen mobile sold as available from great distances. In fact, it's well-known that signal propagation is one of the areas where 8-VSB modulation outperforms OFDM, and a major reason why the FCC went with 8-VSB 20 years ago, when Sinclair was pushing for COFDM. When ATSC 3.0 becomes a reality, look for a wave of stations requesting power increases, and the FCC revisiting their power limits.
Although I have a favorable location for OTA, my readings were taken from indoors. With a stucco house, the chicken wire on the outside walls that hold the stucco in place also attenuates the signals somewhat. Mobile viewing will always be subject to those limitations, regardless of modulation. It will remain to be seen how forgiving ATSC 3.0 is; what we do know is that ATSC 1.0 is completely unforgiving. I can't imagine it getting any worse.
What I did show is that it doesn't necessarily require rabbit ears to receive hi-VHF, especially the full-power stations. And UHF should be a slam dunk. Although it was a 15 kW signal on RF ch 36, there is also a co-channel station in Tucson, 100 miles away. I can't say how lo-VHF will perform, as the closest LPTV station to me is 100 miles away in Tucson, and the closest full power station is 300 miles away in Las Vegas, and those are ATSC 1.0 stations.
Well, congratulations! It looks like you and I have completely hijacked this thread, so I'm going to try to tie back to the topic by saying that if ATSC 3.0 lives up to what we know is true - and not the hype - we could see more and more diginets coming. Word is that the broadcast networks and station owners are more likely to air additional content at up to 1080p, rather than dedicating the channels to 4K content, so there will be more room for new diginets. Weigel and Katz both seem committed to producing new diginetss, and I've fairly impressed with the alliances with major networks that they've been able to forge. I am disappointed that Weigel seems to abandon the old ones, such as ThisTV, in favor of the newest shiny keys, but at the same time, I'm glad to see that the new diginets are more than just rehashes of TV Land.