Ok, thank you very much. Boy, they sure are active for Park Police. It was around midnight and during a ten minute span I must've heard about a dozen traffic stops. Anyhow, the correct frequency of 166.925 is duly noted. Thank you.
Although I live in Richmond and don't have an outdoor antenna, I routinely get things out of the NoVA/DC/MD - and even Pennsylvania sometimes. For example, I get Loudon County Fire on 46.38 MHz fairly good, and a taxicab service out of DC somewhere in the 400 MHz , I think 460 MHz, band. Down on VHF low - which is actually my favorite band to surf through - I've gotten small, rural fire departments from western Maryland and adjacent parts of Pennsylvania.
I use a Yaesu FRG-9600, not a typical police scanner. An upconverter for shortwave takes me down to VHF low. Too much information, I know. But I love my Frog.
Larry