Probably 124.510 Mhz. That is the current airport frequency there and it is unlikely to have changed since.
Very cool article. But it sounds like that would be out of the likely range?
That's close enough to the cutoff that I could see it being in range maybe for the right species or even a slight mutation/evolution. Even if all they know is "I know North but a little less definitively than usual", that could be enough.