Gentlemen, I have an idea for a "portable AM radio" antenna to allow the
user to hear the station clearly while walking, no matter what direction
the radio is held.

Just have three bar antennas, aligned along the X, Y, and Z axes, like
http://en.wikipedia.org/wiki/Jacks , or independently placed inside the
case. A microchip would constantly pick the best signal from amongst
them. Maybe even just two axes would do.

Great for farmers who are walking around all day, and just can't give up
their favorite AM station for FM.