> Those 'antennae' don't *quite* (wincing in agonizing pain > now as an RF-head) as actual antennas - capacitive probes: yes! I thought they were more inductive. The conductive material in the nail effects the AC magnetic field near it, which causes a slight change in apparant inductance of a coil, which causes a slight change in the frequency of an oscillator that is sensitive to the coil inductance. I suppose one could conceive of systems that did use an antenna, but it would definitely be operating in near-field, which is not the traditional mode for what most people call an "antenna". ******************************************************************** Olin Lathrop, embedded systems consultant in Littleton Massachusetts (978) 742-9014, olin@embedinc.com, http://www.embedinc.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.