Madrak, R.L. Pellico, W. Romanov, G.V. Tan, C.-Y. Terechkine, I. JACoW Geneva, Switzerland 978-3-95450-180-9 10.18429/JACoW-NAPAC2016-MOPOB29 English 134-136 MOPOB29 ion cavity solenoid resonance ISOL Contribution to a conference proceedings 2017 2017-01 http://dx.doi.org/10.18429/JACoW-NAPAC2016-MOPOB29 https://jacow.org/napac2016/papers/mopob29.pdf A perpendicular biased 2nd harmonic cavity is being designed and built for the Fermilab Booster, to help with injection and transition. The frequency range is 76 - 10⁶ MHz. The garnet material chosen for the tuner is AL800. To reliably model the cavity, its static permeability and loss tangent must be well known. We present our measurements of these properties.