I'm hearing traffic on 154.77 MHz this morning. The tone is 131.8 Hz and it sounds like an aircraft police unit of some sort. I'm only hearing one side of the conversation (the aircraft side). There is a statewide listing of 154.77 for mobile use, so more than likely this is one of THP's choppers. The context of the radio traffic is difficult to understand but it doesn't appear to be a speed trap like some states do using aircraft. I'm hearing this from about 20 miles west of Nashville. Anyone else hearing this?