I typically listen to quad com for police stuff (they cover east, west dundee, carpentersville, sleepyhollow, south barrington and barrington hills)
Kane county is another good one to listen, along with tri com.
State police are decent to listen too, ive heard probably most chases happen with them. district 15, 2, and chicago i get out in the elgin area.. with all the expressway shootings district chicago can be fun sometimes to listen too.
You need to create a P25 trunk system for Tower 126-Aurora and put in a "wildcard" and lock out the Encryption...You get the info on this web site in the database ILL-Starcom.....So Elgin seems to be moving to this tower dispatched by Tri-Com ....
You can get the conventional South Elgin Sheriff I believe at:
155.68500 KXC471 RM 107.2 PL SElg Police Police: Simulcast of County Sheriff
The RR database says it's deprecated, but I still hear allot of traffic. Just fyi.
This page is not showing you as a premium subscriber. If not, consider at least $15 for a 6 month subscription. This is the best way to download most all of what you need. (I may be wrong as I do not know anything about the Whistler's)
Is this your first scanner? It is really a steep learning curve today. Check out Radio Reference and the WIKI for help with all of this. You most likely will not get much from the user's manual, but then again...just a guess.
I just looked up your radio. It's a fine scanner, but it will take time to become proficient. My experience is that the "more hair you pull and the louder you scream" gets the best results.