Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,RATWARE_GECKO_BUILD autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id tA8L9g3l010672 for ; Sun, 8 Nov 2015 22:09:42 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZvXBA-0000o5-79 for rs_out_1@blacksheep.org; Sun, 08 Nov 2015 21:07:12 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZvXB9-0000nw-VX for rsgb_lf_group@blacksheep.org; Sun, 08 Nov 2015 21:07:11 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1ZvX9v-0007hH-EH for rsgb_lf_group@blacksheep.org; Sun, 08 Nov 2015 21:07:10 +0000 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id 984793273A5 for ; Sun, 8 Nov 2015 20:57:11 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 4F39828A003C for ; Sun, 8 Nov 2015 21:05:37 +0000 (UTC) Message-ID: <563FB921.9040209@abelian.org> Date: Sun, 08 Nov 2015 21:05:37 +0000 From: Paul Nicholson User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <1843908200.20151104162925@chriswilson.tv>, , <8E31BC8EB75546E59F99E35AFAAA0DEE@AGB> <563DD93A.22662.37C4EA@mike.dennison.ntlworld.com>,<563FA745.9010002@posteo.de> <7E7DFBB4D102A04DB5ADC88D66628A4A444528AF@ICTS-S-MBX1.luna.kuleuven.be> In-Reply-To: <7E7DFBB4D102A04DB5ADC88D66628A4A444528AF@ICTS-S-MBX1.luna.kuleuven.be> X-Scan-Signature: 4ad5f3f1a9241b934aaa5d0e23c9dc57 Subject: Re: LF: Capacitive top hat question Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 4924 > I remember to have read somewhere thate (French?) military > in the Sahara desert just put a dipole antenna on the > sand on top of a dune and it worked fine. Somewhere I have a paper describing something like that. I recall an antenna at ground level or actually a little buried, and its effective height was related to the depth of the water table below the dry sand. Maybe a well or borehole was used to connect to the 'ground' plane. I'll see if I can find it. -- Paul Nicholson --