WiFi is often hopping frequency and you need to disable spur reduction to better see it.
But with disabled spur reduction you will also see all kind of mirrors and spurs when doing such a wide scan.
Another option is to do a narrower scan around 5.5 GHz? (span 200 MHz) and enable MAX HOLD
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Did you read the page in the WiKi about the Ultra mode? I assume as you are using the Ultra mode, so you know when the Ultra mode will fail
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Designer of the tinySA
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