Gene, I may not be correct in my use of "electrostatic," and yes, the prefix does imply static conditions; but I believe that's not always the case. What I was referring to was plain old capacitive effects, not an RF field. (Which admittedly is somewhat questionable this close, relative to a wavelength, between antennas.) What I was trying to imply, is that you have two pieces of metal which are near one another. The fact that they are formed into loops doesn't matter. You've excited one of them (the TX one) with an overall voltage relative to ground, by driving it unbalanced. You take the other one and measure its voltage relative to ground, because it also isn't balanced. And you detect a signal. If you flip the polarity of the RX "loop" by reversing the grounded and sense ends, you're still going to detect the same exact signal, because it is being picked up by the capacitive coupling between the two pieces of metal that you call antennas. Or, perhaps, by the (capacitive) coupling into the scope probe/leads, or the leads to your RF preamp. Andy ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu