I just got a PRO-164 scanner today and had the trunking channels set up at radio shack. The link to the trunking channels for my area is Scanner Frequencies: Sheboygan County Trunking System, Sheboygan, Wisconsin. However when i listen to the channels i hear nothing no static or any sign of life! Is this just how it is and it only makes noise when transmissions are sent (however i monitored a few police channels and still got nothing) or is there something wrong with the setup. I attached a screenshot of what the screen says when its apparently playing audio. Im a total newbie at this being this my first day with my first scanner so please help!