I'm a little suprised the AMT3000 isn't mentioned a little more on this thread than it is?
I'm in the armpit of decent AM, now I can enjoy everything on the web through any of my AM radios with more stations than can be imagined.
If you can melt solder and follow a step by step schematic, you are in like Flynn.
www.sstran.com
(just a happy customer)