Hello. I would like some information on what scanner I should purchase. I live in Cook County Illinois. The issue is that I'm not sure what scanner I need given the data I have. I have some frequencies that are short in length for example Police Station ABC @ 473.01 and others such as Location 123 @ 465.23267. I was told if I wanted to (with the caveat that various frequencies should not accessed due to privacy) listen to frequencies that are 7 digits long, I would need a narrow frequency scanner. Any help would be great.