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> spectrum monitoring".... is definitely a thing that is done in many places

Not by Ofcom it isn't!

(At least, certainly not on any scale as far as RF interference/spoofing is concerned).

Ringway Manchester (YT radio enthusiast) has a good video about OFCOM DF monitoring: https://www.youtube.com/watch?v=lMUwIpWvnbE - may have been scaled back now, though.

Come to think of it, the mobile operators themselves have a large national network of radio receivers with lots of fancy time-of-flight, phased array multi-path, multi-band capabilities.

Maybe these days Ofcom can just ask them if they are interested in something specific.

They also rent space on the towers for other people's equiptment.

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