UtterDisbelief
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Fifteen pages in and I'm loosing track, sorry. So to resume the Atheros wireless issue ...
I take it you downloaded the modified IO80211Family.kext from the link you mentioned you'd checked?
What this does is take the Mojave Atheros drivers and add them to Catalina.
The actual kext with support which Apple dropped is called: AirPortAtheros40.kext
You can actually take this from a Mojave installation and add it manually yourself to System/Library/Extensions.
I have not tried this myself, so you should make any backup you can to preserve your data.
I take it you downloaded the modified IO80211Family.kext from the link you mentioned you'd checked?
What this does is take the Mojave Atheros drivers and add them to Catalina.
The actual kext with support which Apple dropped is called: AirPortAtheros40.kext
You can actually take this from a Mojave installation and add it manually yourself to System/Library/Extensions.
I have not tried this myself, so you should make any backup you can to preserve your data.