In the event of an EMP most everything with a transistor could become non-operational. AM stations signals can be carried much further than FM, possibly from unaffected areas, depending on conditions , this is where you could get your most important information.

The Patriot RadioTM is meant to receive the strongest AM station in any geographical area by picking up the signal in the air.  It requires no charging, winding, sun or batteries. 

* The presence of concrete buildings, high voltage lines and topographical barriers could have an effect on your reception, just like the AM radio in your car.