To provide you with the most useful write-up, I have categorized the "scanner sound" into three common contexts: , Radio/Police , and Digital/App sounds.
You can record these directly from free online radio monitors like Broadcastify . 3. Sci-Fi & Digital UI Scanners
These are "lo-fi" atmospheric sounds often used in gaming or true crime storytelling. The white noise between transmissions. Police Dispatch: Distorted voices with radio clicks.