I'm looking to start building various antenna tuning circuits, but I'm limited by my parts inventory. I have pots and mag wire for winding inductors and a nice spectrum of fixed-value capacitors, but I have no high-voltage parts, nor variable parts.
The instructions I find online for mag loop antennas, in particular, require high-voltage variable capacitors. I'm still grappling with the theory to understand exactly what voltages are involved, but tuner circuits I'm finding around the web also involve variable caps/inductors.
Where do I find these parts for sale, or are they reasonable to build at home? I've been to a couple of local swap meets, but they're almost entirely PC parts, software, and manuals from the 90s. No vintage radios that I could find to pirate parts from.