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The question is, where are you and what do you want to listen to? Police and fire in my area are all analog, so a SDR stick works well, my city Fire and Police can be picked up with a small antenna. If you want to listen to stuff a little further, like the county, or another city nearby, you will probably need some sort of rooftop antenna, but again it depends on frequency, distance and power. I use https://www.openwebrx.de/ and run it on a raspberry pi, The cost of the SDR + Raspberry PI and a simple antenna would be about $100 amazon dollars....
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Hence, a higher number means a more popular project.
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