I'm pretty sure the wifinigel site does quote where it gets all its info. His white paper thing is my usual source of info on 5GHz wifi in the UK though I do have to wonder if anything has changed since he wrote it.
But in any case, yes, it seems like 149 ought to be possible.
I do see people using 120 to 128 though some manufacturers, possibly reasonably, don't offer them for use at all.
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