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It's a Unifi Dream Router 7. The 6GHz doesn't reach through the wall IIRC
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That doesn't support high power 6GHz (called standard power/AFC). You need one that does support that to get the (much) higher 6GHz transmit power.
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Why would 6GHz make such a difference compared to 5GHz?
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Because it supports (on WiFi 7) 320MHz channels. So there is double the bandwidth. 5GHz only supports 160MHz channels.
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Wouldn't it make more sense then to ask about high bandwidth channel support rather than frequency support? It's not the frequency that's important here.
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Higher frequencies support higher bandwidths though.

I don't think the 2.4GHz band even has 160MHz free, for example. Literally impossible to support because 2.4GHz to 2.5GHz is all you get (100MHz or so).

5GHz isn't much larger than 160MHz. Like it can fit but some number of channels is better for everyone.

6GHz band is like 5.9GHz to 7GHz or something stupidly wide. Because of the new wider band, you can effectively have larger channels with fewer problems.

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The brick wall will prevent any and all 6GHz penetration.
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Not at higher power output, which that router doesn't support.
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