The patch of WAPD is always active except during busy events on the grounds such as the "State Fair" where it seems the patch is off. I've also noticed the same silence from the sheriff and WAPD the past few weeks. Although this is a trunking system, the WAPD patch and the Milw Sheriff F2 patch are usually heard on 453.2875. I've never heard the WAFD patch on this system.