You guys are assuming this will get rubber stamped, and it won't. Class A stations in the U.S. get protection from interference. Don't believe me, you can google this. Then explain why CKXT on CH15 was not allowed to broadcast to the south towards Grand Island and had a directional antenna broadcasting mostly to the north and west. Simple, they had to protect WBNF from interference. CHCH will simply have to use a directional antenna, broadcasting away from Grand Island if they go on UHF 15. By the way, LPTV stations don't get protection, but LP Class A stations do.
Here is an excerpt from the FCC's website regarding Class A television stations such as WBNF:

1. In April 2000 we released a Report and Order establishing a Class A television service.1 Our action implemented the Community Broadcasters Protection Act of 1999 (“CBPA”), which was signed into law November 29, 1999.2 Pursuant to the CBPA and our implementing rules, certain qualifying low-power television (“LPTV”) stations will be accorded Class A status. Class A licensees will have “primary” status as television broadcasters, thereby gaining a measure of interference protection from full-service television stations, even as those stations convert to a digital format. The CBPA and our Report and Order will facilitate the acquisition of capital needed by LPTV stations to allow them to continue to provide free, over-the-air programming, particularly locally-produced programming, to their communities. In this Memorandum Opinion and Order on Reconsideration, we dispose of petitions for reconsideration of the Report and Order, make changes to some of our rules, and provide clarification of other rules.3

It clearly states that they get protection from Interference from Full Power Tv stations such as CHCH.