If you change that title to Public Safety Monitoring, then I can reply.
It was looooong before scanners - 1955 to be exact.
I first monitored Police, Fire and Public Works on 1.714MHz, just above the broadcast band.
Then it was Army surplus tunable tank radios on Lo Band (30-40MHz)
Then it was surplus taxi and business Motorola and GE two-ways on Lo Band and Hi Band..
Then finally, scanners.
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