wrote in message ...
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.

It is my experience that the null of a ferrite bar antenna is very few
degrees,
making it a little dificult to get a good null.
I have not had a problem with AM.
FM on my mp3 player which uses the headphone cord as the antenna and
is a problem with respect to the direction and terrain around me.