The tails lower the resonate frequency of the dipole so it is matched at the CW end of the band. The first step is to tune the dipole to the center frequency of the phone band. I then soldered ring terminals at each end of the dipole. The next step is to make up the wire tails.
Start with wires about 5' long. Put a ring terminal on one end ofthe wires. Connect the two tails to the dipole ends with stainless steel screws and nuts. Tune the antenna for the CW portion of the band by trimming the ends of the tails.
Just lower the dipole ends and add or remove the tails when you want to switch modes. This takes about 10 minutes, but I only do it when I want to do a contest. Since the shunt fed tower is tuned for the CW end of the band, I usually leave the tails off so I have something that can be used on phone between contests.