Actually, the antenna match system on the GF or BC-230 will match purely resistive high impedance antennas also, right, because it is just a tapped coil, is that right? If i recall, the GF at least has even harmonic suppression because it has a pushpull PA. The BC-230 has what, a single PA, but neutralized? That should be a pretty good harmonic generator, if i have the circuit correctly. Hue