> It may require a bit of tweaking to get the > +/-j component tuned out, but with suitable test equipment that is easy > to do. > I would like to learn more. I have access to signal generators, spectrum analysers with tracking generators and network analysers. I guess at resonance the load appears completely resistive and current is in phase with voltage. Therefore, my first approach would be to use a CRO with a current probe. Drive the antenna with signal generator at the desired frequency and see how it behaves. However, I suspect you refer to another approach. I would welcome any suggestions. Justin --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .