Ok, I'm going to start this post off by saying that I currently know practically NOTHING about trunked scanners. I live at the northwestern point of Illinois, so I have Iowa and Wisconsin radio traffic that pertains to areas near me. I'm nosey, so I naturally want to listen to LEO activity around me. Picking up my Illinois and Wisconsin frequencies is no problem with my Uniden Bearcat BC145XL 16 channel base scanner. However, the Iowa frequencies near me I cannot pick up. All that I know about them is that they are trunked and in the 800 MHz range. A friend of mine highly recommended the Radioshack Pro-94 scanner. This is a dual-trunking scanner. Could someone explain to me what "dual trunking" and "triple trunking" really are? I see that there are several different 800.xxx MHz frequencies for the same city. How does this all work together? What is a talkgroup? I have read all over the place but I can't find one simple explanation on what is going on. Any help would be appreciated.