Second Hand MFJ-974HB. 6 - 160 Meters Balanced Line Antenna Tuner. The MFJ-974HB is a fully balanced true balanced line antenna tuner. It gives you superb current balance through its very wide matching and frequency range. The MFJ-974HB is a fully balanced wide-range T-Network using four gear-driven 1000-Volt air variable capacitors and high-Q air wound tapped inductors, for 80-10 Meters and separate inductors for 6 and 160 Meters. The tuning components are mounted symmetrically to ensure electrical balance. A 1:1 current balun is placed on the low impedance 50 input side to convert the balanced T-Network to an unbalanced operation. The balun is made of 50 ferrite beads on RG-303 Teflon™ coax to give exceptional and efficient isolation. It stays cool even at maximum power.