I've installed an 80 meter dipole fed with around fifty feet of ladder line to a DX-Engineering current balun and SG230 tuner. It tunes fine on all the bands, including 160, which surprised me. Just for curiosity, I connected my Rigmaster antenna meter to to balun to see where it was resonant. Surprisingly, the resonant frequency is nowhere close to what I expected. Now I know that when using a tuner and ladder line, the resonant frequency doesn't really matter. But I would love to understand why the graphs are as they are. The dips (base on 50 ohms) from left to right are: 4.666MHz, 13.998 and up. Phase measurements.