We'll be moving to southern Arizona.

I'd like to continue MW-DX
without interference from Mexican AM transmitters.

Is there any way to set up an outside antenna
to receive "from the north" only ?

For loopstick radios,
I was thinking of a grounded metal plate
on the back of the radio....

I don't think a loop would work for this application...

Any other ideas on blocking directional interference ?

rj