I don't know if you're aware of it or not but the newer GRE, RS and these Whistlers do NOT have stationary or check all CC modes in them like the older scanners do.
Instead they have roam only. Why on Earth they'd do that I have no idea but they did it.
It looks through all sites and locks onto the strongest signal within the parameters you set and stays there until it goes outside those parameters then checks for something in them switching over to whatever meets it.
Which means if you can receive five sties it will lock onto only one of them, the strongest and stay there.
That sucks because it won't pick up all the traffic on other sites.
What I've done on my 668 is put each site of interest into its own bank. Then I set up banks for areas of interest and associate the individual sites with the one area bank.
So for example for one area bank I have North Mtn 222, Peter's Mtn 221, Duncan Knob 223, Sounding Knob 224, Bath 226 and Ft Lewis 218 in their own banks.
I then have an area bank called STARS Local and affiliate those individual banks to the area bank. It now scans all sites in the "STARS Local" bank thereby not missing any traffic.
Have set ups for Roanoke and Lexington area too. Just turn off one and turn on another as you need. Put in different site banks for those other areas and sometimes overlap too. Adding site banks to the area bank is easy. For instance I have 218 in several area banks just by checking banks on the bank list.
Its a pain in the behind to do but the easiest way I've found is to import entire STARS system then duplicate it however many times you need. Then go into all those duplicates and either delete or lock out all sites but the single site for each bank you want in it. You also will need to rename each bank to the site it applies to.
Then create your area banks and affiliate the individual banks you want scanned into the area bank.
It then shows up the old way or like in Unidens scanning each site as it goes along and what site you're scanning shows up on the display.
You then get all the traffic its possible to pick up off the sites you can receive. For example I get a fair amount of stuff off 223 that I don't get on 222 so I'd be missing a bunch if I wasn't scanning the 223 site.
Hopefully this is of help to you.