A
AnyHuman
Guest
It's discontinued. That should tell you something...
And you can fit a decent but not great AM antenna in that size; just a few loops of wire embedded in the case will do it, or part of the case can be made to function as a ferrite core for the same purpose. It's been done a lot before for small novelty radios.
Go search Amazon for Portable HD radios, you'll find more than one.