The catalog number was 15-1853, RS discontinued the antenna about a year ago.
All you need to do is set the antenna next to your AM radio, tune the radio for
the best signal and then tune the antenna. You should hear a boost in signal
strength but you may also hear a boost in the noise level. Also try putting the
radio and antenna on a lazy susan turntable and turn both to improve signal.
The cable that came with the antenna was a 1/8th mini plug with about a 4FT two
conductor wire to attach to a radio with external antenna conections. The wire
to me was more trouble that it was worth, but a lot of people report good
results with it. Hope this helps.