I’ve done searching on the forums here and on the general web and it seems that Peplink don’t support any kind of DFS frequencies on any product. Can someone confirm this?
Also, I’m looking for suggestions for access points that do support DFS frequencies for congested buildings. 
they do support them, just tell them you are in Tijuana taking some shots
be advised however that they do have DFS detection, even if you set them on, if there is a DFS source nearby they will auto disable and change channels until the next restart
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So, setting my locale to Mexico will allow me to select DFS channels for my B20x AP?