>Do you have such a device or could you get one for me? Thanks
MFJ also sells one of these. It is very small (1x3x3).
You have to put it (in-line) on the antenna wire before your am radio.
And provide 13 VDC to it.
It has two switches two select switches for 49,31, and two other meter
bands I cant remember. It works pretty good, but has a real problem
with changing temperatures in my truck. In the morning I start at
620-AM to hear Monitor Radio in the 31 meter band and within 30
minutes I have retunned up to 670-AM due to the temperature shifting
the superhet frequencie. It doesnt appear to be bothered greatly by
motor hash like a few other short waves I've had.