I neglected to mention before, and others can comment as well. The other issue with scanner listening is reception. If you can't get the signal you won't hear anything either
I had my best success with a recommendation I got on the web. Using a discone antenna (easily found at RS) and some RG-8 cable (the thick less flexible stuff) probably increased my distance and clarity by 2-300%. If you get a base model you might also think about signal availability in the area and the potential issue of having an outside antenna. I was in a semi-rural area at the time so the need was greater.
You might not need anything like that, just wanted to point it out for consideration.