I have seen numerous ideas along the lines of a coax resonator. In the spiral coil I have used 10 and 11 meter 1/4 wavelengths of wire rolled into a spiral and it is the only coil I have seen the actually will resonate on the 1/4 wave principle. I have found that the input is around 140 ohms for a resonator made out of a spiral and so a little capacitance can pull it down frequency a bit to make a vfo coil in the 1/4 wave band.
KA9RZA
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