Back in the day, radios were AM only, and if you wanted to listen to your favorite programs you had to have an outside antenna. With the advent of the transistor radio, there soon ceased to be any way for you to connect your radio to an antenna. Most of the time, admittedly, the internal antenna worked well enough anyway. But not for everybody.
Step 1: Weakest is Best
But even if I put up an outside antenna, what good is it without a way to connect it to the radio?
Well, this antenna doesn't have to connect to the radio.
I know that sounds too good to be true, but it is true. The signal, gathered by the long wire antenna is inductively coupled to the radio's internal ferrite antenna.