A popular antenna system for wide frequency coverage is one called a center fed Zepp. This antenna is a variation of the antenna that used to trail behind Zeppelin airships in the 1930s. the antenna is not “wideband” in the sense as previous examples. Instead, it has a feed impedance that varies widely with frequency, but which is compensated for at the radio end of the transmission line by a tunable matching network. The center fed Zepp can operable on all frequencies above (and even somewhat below) its /2 resonant frequency.