The best thing I can tell you is to only scan with the sites in your area. "Avoid" the sites you don't need the scanner to listen in on.
For example, if you live on the east side of Tucson, you might want to have only the following sites on: Simulcast A, Simulcast B, Mt Bigelow, and possibly Haystack Mountain.
If you live by Sahuarita, then you'd probably want Keystone Peak, Childs Mountain, Arivaca, Simulcast A and B.
If you live up in the Oro Valley area, you'd want to focus on Simulcast North, Golder Fire Station, Mt Bigelow, Confidence Peak, and possibly Simulcast A and/or B.
The point of this is too many sites, causes you to either miss transmissions or receive the transmissions from more distant sites at a depressed quality on the scanner.
Experiment and see which gives you the best signal when you are home, vs work, vs on the road.
When I am travelling around the Tucson Metro area, I have Simulcast A & B, Keystone Peak, Mt Bigelow, and Haystack on. If on the fringe, I'll add in the sites for where I'm at.
I've found that when I am outside the Tucson area, turning off Simulcast A and B also helps.
It's a science that you have to figure out which works best for you.
Have fun !
I've been meaning to break the radio up in to geographic areas of PCWIN system for my own scanner. Maybe I'll have to revisit that and see what I can make up there, after I saw the favorite file, it got me to think
