As noted in Table 4-1 and Figs 4-6

As noted in Table 4-1 and Figs 4-6 to 4-5 and earlier sections of this chapter, you can use dipoles of electrical lengths other than /2 effectively. The consequence of using an antenna that isn’t resonant (or which is resonant but doesn’t match the transmission feed line ) is that you will need a matching network to couple power from the transmitter to the antenna system. If the matching system, generally called an antenna tuner, is located at the antenna itself, 50Ω coaxial cable can be used for the run to the radio room. If the matching network is located near the radio equipment, particular attention must be paid to losses in the transmission line, since the SWR will be quite high on many bands.