Typically you would use a spectrum analyzer to look at the frequency range in question. Problem is most of them are expensive. We use a product from Ekahau when doing site surveys to determine wifi in use and interference from things like microwave ovens:
https://www.ekahau.com/products/spectrum-analyzer/overview/
I believe we paid over $6000 for it though.
There was a cheap one out there that worked well I'll see if I can find it.
Other option is a software defined radio that can tune the 2.4GHz band, coupled with a radio program like SDR# (pronounced SDRSharp) that can scan the band in question. You look on the scan as its happening for peaks in the frequency range; those are either your wifi AP's or other devices causing interference. @gjacobse may have some info on one; the one I have doesn't go up that high in frequency.
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