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Basic Formula:*Feet length = Total length - 468 / frequency The all band doublet antenna is a 1/2 wave dipole cut for your lowest operating frequency. It should never be connected to the tuner with coaxial cable. The best choice is 450Ω ladder line from the antenna wires to the antenna tuner. You will end up with an antenna that can be used from the lowest cut frequency up to 10-meter on your HF ham transceiver.People have used 300Ω flat television line, however, due to the gauge of the wire this should never be used to transmit with more than 150 watts of power. The impedance issue doesn't seem to be significant according to many sources, as 300 ohm wire can work as a substitution for 450 ohm ladder line. The impedance is the result of the spacing of the twin wires. The 300 ohm television wire simple has the twin closer together. What is extremely significant is that the spacing of the twin wires is consistent.