You Can buy Cat 5 outdoor one in Home Depot etc .. Yes they have it for sure ...
I don't see why you can't have wifi ... in Concrete building .. Just buy good antenna ... I mean good one not those sticks from FS or BB they are good for small office ... You have some nice Yagi, Panel antenna on Ebay .. or you can do some BiQuad on your own .. And I Guarantee that you will have enough signal
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