Sorry, I am in Washtenaw county Michigan and trying to listen to the trunked digital state system, I only have a couple talk groups programmed in and downloaded direct from here. I have great signal on the control channel but it seams to intermintently drop out. Is it supposed to stay locked on? occasionally nfm comes up. I have a pretuned yagi for 806-860. I get mixed reception from the same dispatch center for instance if I am listening to HVA. I get great sound quality and occasionally it is horrible or non existent. I have all the channels programmed in, not just the primary and back ups. Should I stop using the yagi since the tower is so close, IE 6 km and just put a rubber duck up that high? I know I am high enough for clean line of sight. Is there just something I'm missing?? I appreciate the help from everyone!