The type of scanner you're going to need depends on where you live entirely these days because of the trunk systems. If you live in an area that has a trunked radio system, you need to purchase the Uniden BC-235xlt or the BC-245xlt.
The BC-235xlt tracks only Motorola type I and II 800mhz systems. This is the older version of the trunktracker.
The BC-245xlt tracks all Motorola and GE systems. EDACS is growing around the country so it's probably more appropriate to get the BC-245xlt. If you travel, you definately want it. This machine also does service scan so you can hit the button and it will scan all of the police, fire, etc. I love mine and couldn't live without it. Most all the systems I listen to except Raleigh are trunked, many of them the Ericsson/GE EDACS type systems. If you live in a small town with no trunked system, and you don't plan to travel, you won't need such a radio.
The best way to get the radio is direct mail. You can get them for about $250. 00 now. They were selling new for $400. 00 not too long ago but the market wouldn't bear it.
They don't make a mobile version of this scanner yet but I think they will soon. They DO make a mobile version of the BC-235 but again, you need to make sure the systems you're going to listen to are Motorola.
Email me if you have more questions, I would be glad to try and answer them for you. I can give you more information if you want.
Jack
jack@thorpe.org