interesting project for sure - but why !!! ???
Only user case I can see for this if someone was trying to protect a location from FPV flights and having it send an alert to a user to go and investigate - but it seems this will only detect analogue systems so if your on an O3/O4 DJI digital system it will do nothing.
Cool project for sure and I do love seeing Meshtasic being used in all sorts of cool ways and this is a new one to me.
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Or any of the other digital systems 
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Would it also detect encrypted analog vtx? Simple encryption methods would bypass this easily.