Is there an AM i-pod add-on?

I was wondering if there is an AM radio i-pod add-on in existense?I would love to listen to baseball games without dragging Am radio with me.I don't care for FM though.Thanx for your help.
I did the typical internet search with a couple of engines:

Appears there are quite a few others looking for the same thing. Currently there is no such device, with reception pointed out as a stumbling block.

FM can make use of the headset cord but AM is more particular :^).