The terminated, tilted, folded dipole (T2FD) is a wide band HF antenna. It was tested by the US Navy after WWII, and is popular with SW listeners who desire wide coverage without having to resort to many individual antennas for each band.
The T2FD easily has a 6:1 frequency ratio. It is a form of loop antenna, and is typically fed with 75 ohm coax and a 12:1 balun.
Details on the T2FD can be found here: [ HCDX T2FD Page]