Did you check the FCC for local Sites they would be listed.
If you see 2 or more sites (Repeaters or Trunking Systems) with the same frequencies then yes you have Simulcast in your area.
I believe the closest simulcast system near Butler County could be Springfield, MO or Christian Co. Most radio signals down your way is VHF or part of the MOSWIN system.
I was wondering if, anything had changed as far as Simulcast. I've been listening to my BCD536 at home between trips to St Louis for Oncology. Beginning to seem like we are there more than at home.