Sharing this variable inductor I threw together last weekend. 22AWG magnet wire. Taps at 6,6,12,12,~90+ turns; 3 ferrite rods from some junk bin AM radios glued into the shaft of a 60ml syringe. Using a 1/4 wave vertical wire cut for the middle of 20m and a moderate radial field this allowed me to impedance match anything from 160 to 30. Efficiency is probably shoddy at 160, but I made a QSO on 40.
Also made a varicap on the same base. In this config @ 14 mhz it gives 26-200 pF.