Here are some details I can give you.
State is Mississippi
County is Alcorn
City is Corinth
Looking for Alcorn County Sheriff and Corinth Police
Closet sites are Farmington and Pine Mountain
TGID 50000, 50001, 50006 (Gathered from a local tech)
I can pick up some talk on the 50001 but not all the time.
Now I am unclear about what you want. If you are seeing TGID's like 50001, you must have the correct
(MSWIN) Trunking System, (I am assuming this is the system) sites programmed. Since, the BCD536HP would have downloaded all the sites listed, (including both Alcorn sites), my guess is that you really want to know what TGID's are for your City and County. The only way is to pay attention to which TGID's seem to relate to your area, and also wait until others have entered some in the DB. it looks like Alcorn are sites 41 & 42, but you may be looking for others. The sheriff would likely use these Alcorn sites, as would Corinth police, so you just need the TGID's for them Hopefully, users close to you will help, or you can post a question there:where it talks about Alcorn coming online.
http://forums.radioreference.com/mi...m/280854-official-mswin-tgid-2014-thread.html
As for not receiving sites reliably all the time, that is a function of your location and antenna. What do you have for antenna, and how high off the ground is it? 700Mhz can be harder to get than your old VHF. . The other consideration is your zipcode, which would determine what sites you will receive. You may have to extend the radius to get other sites,. Don't have a 536, so can't help more.
Since trunking may be new to you, this should help:
Trunking_Basics