audioguy said:
CBE appears to be the only Canadian station on 1550. If they didn't want to use the frequency in Windsor, there is a possibility that it could move to another city, such as Toronto or Montreal, where there would be more demand for a radio signal.
I suppose Montreal is a possibility if the 1570 in Laval (used to be CFAV, but I believe it has just changed calls) wants to move to 1550 to take advantage of the 1550 channel's Class A status in Canada. And I suppose Toronto is also a possibility if CHIN wants to move from 1540 for the same reason.
However, even if neither station wants to move, Canada will not give up the international notification. It has done so only a couple of times. In one case it gave up an unbuilt 820 in western ON because the engineers who designed WCPT's night upgrade showed Industrie Canada that they could substitute 770, which Canada then reserved. That change allowed WCPT to use higher night power than it otherwise could have used. I think there has been only one other case. That time, the new Canadian station was not built on the vacated frequency but on an adjacent channel, making the vacated channel unavailable for Canadian use in the dark station's former location.