business trunking systems are usually pretty busy....
have you tried
London Radio Service Trunking System, London, Kentucky - Scanner Frequencies
here are a couple of places to check....
try searching between
1) 849 - 869 for moto, edacs and ltr systems.
2) 451- 455 and 460-465, should be plenty of ltr systems
If you want to expand that to include Federal trunking
3) 406 - 424, I think there are a couple of Federal TRS's close to you
If you have a decent antenna , coax and connectors you should be able to pick up something.