When you use a capacitive hat, you can shorten the antenna. With a stylus from 80 cm and a capacitive hat, you can have the same efficiency of a stylus along 180 cm.
It is also possible to use capacitive hat and a stylus along to achieve better efficiency, specifically on low bands. The hat is made from a stainless steel bar from 30 cm 3/8 "threaded and with the capacity created by 30 cm stainless steel rods 8.
Note: when using capacitive hat with the whip by 180 cm, the resonant frequency is lowered, making the bands of 10 and 12 meters. When using the short whip (145cm) with capacitive hat, all bands are available but with reduced efficiency.