If I was in your shoes, I'd perform a Site Hold on your strongest site, run it in ID Search, write down the talk groups that display, cross-reference with the database and that will give you a real good idea of who uses the site. Then go to the spot where the other sites are being decoded, and repeat the process.Ok I understand the site hold process a little better now. Thank you for the clarification, makes perfect sense.
So, i would like to just cut the 2nd channel. But as stated, the state patrol has a fair amount of their transmissions on that channel. BUT, sometimes the transmissions are happening on my closer local site, I would say 1/4 of the time irregardless of their location. So if cutting the 2nd channel pushed all that radio traffic to my local channel would be great, but I'm most certain that's not how it would happen.
The antenna is worth a shot as I've noticed declined reception and some transmissions that come across my local stuff that seem to have reception issues. So we will give it a go and see.
It's very possible the state patrol at times "affiliates" with the closer site.
Don't use the terminology "cutting out a 2nd channel" which leads us here to think you're removing a "talk group". It's better to use the terminology "removing the 2nd site" when referring to trunking systems, or you might get confusing instructions to follow.