If you read carefully, I think you'll find that the deadline is 39 months from the forthcoming announcement of the auctions results. Phase 1 stations are expected to have completed their transition before August of 2018. Suggesting that the end of the process is the likely interval isn't logical. The chart shows the deadline to be 35 months after the public announcement with some extra weeks for hardship transitions.
View attachment 125702 nice!! my 1967,Plymouth rag top 440 ,2 door coop.
It isn't reasonable to assume that the future reception solution is necessarily incompatible with the current channels unless you require an array of precisely tuned antennas.
Of course the NAB and other broadcasters have been applying a full-court press of late trying to convince everyone that the deadline must logically be unrealistic. The only thing that seems unrealistic to me is that they're going to be able to squeeze in ATSC 3.0 but that's entirely the broadcaster's problem.