Five interesting patents on underground and survivable antennas (such as embedding the antenna in a large concrete block):
3346864 3594798 3705407 3803616 4687445 To view or download a PDF of these patents, go to http://www.google.com/patents/ and enter the patent numbers. Jack K8ZOA On 6/12/2011 3:34 AM, Stephen Prior wrote: > John Heys G3BDQ's book 'Practical Wire Antennas' published in 1990 by the > RSGB describes such an underground antenna in some detail on pages 79-80. I > don't know whether the book is still in print or in an electronic format > anywhere. > > They are very quiet on receive it seems ...... > > 73 Stephen G4SJP > > On 12 June 2011 04:35, Jim Rhodes<[email protected]> wrote: > >> Tod K0TO one time gave a presentation of an on/under ground antenna >> designed >> for the military. Very interesting. >> >> Jim K0XU Sent from my Xoom tablet >> On Jun 11, 2011 10:08 PM, "Tony Estep"<[email protected]> wrote: >>> I was tuning idly around the 20M digital frequencies tonite when I copied >> a >>> fragment of a PSK transmission, wherein the guy said his antenna was >> buried >>> under the ground. I was sure that it had been a flukey series of garbled >>> characters, so I waited and listened on the frequency. Sure enough, a few >>> minutes later, he faded back in, conducting another qso, and this time >> there >>> was no mistake: his antenna is buried under the ground. Now that's the >> way >>> to outfox the nosy neighbors. >>> >>> good DX, >>> Tony KT0NY >>> >>> -- >>> "We don't want every single college grad with mathematical aptitude to >>> become a derivatives trader." -- Barack Obama >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[email protected] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
