Best portable radio - mainly for AM reception?

[essential]

hey all. i got a new job recently at the post office. i work inside this bombshelter like building, and am walking around doing jobs all day. i miss my AM radio sports talk in the mornings. the building is very bad for AM reception with normal portable radios. i was wondering if anyone knew of any superior portable/personal digital radios ... mainly for AM purposes. i'm talking ones like ipod sized portable, not stationary ones, and not like cd/cassette player ones. thanks.