Return-Path: Received: from mtain-md03.r1000.mx.aol.com (mtain-md03.r1000.mx.aol.com [172.29.96.87]) by air-ma05.mail.aol.com (v129.10) with ESMTP id MAILINMA051-b5244df09bc9389; Thu, 09 Jun 2011 06:09:13 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-md03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7EC2D3800008F; Thu, 9 Jun 2011 06:09:12 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QUc9o-0000ni-6m for rs_out_1@blacksheep.org; Thu, 09 Jun 2011 11:08:08 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QUc9n-0000nZ-Qr for rsgb_lf_group@blacksheep.org; Thu, 09 Jun 2011 11:08:07 +0100 Received: from smtp6.freeserve.com ([193.252.22.191]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QUc9l-0007cK-FX for rsgb_lf_group@blacksheep.org; Thu, 09 Jun 2011 11:08:07 +0100 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3607.me.freeserve.com (SMTP Server) with ESMTP id C8B98700076A for ; Thu, 9 Jun 2011 12:07:57 +0200 (CEST) Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3607.me.freeserve.com (SMTP Server) with ESMTP id BC3F670007CA for ; Thu, 9 Jun 2011 12:07:57 +0200 (CEST) Received: from MLB (unknown [95.144.185.64]) by mwinf3607.me.freeserve.com (SMTP Server) with SMTP id 8A01B700076A for ; Thu, 9 Jun 2011 12:07:57 +0200 (CEST) X-ME-UUID: 20110609100757565.8A01B700076A@mwinf3607.me.freeserve.com Message-ID: <9E1D0F6DD9224C7A86D4227122F486E5@MLB> From: "Martin Evans." To: Date: Thu, 9 Jun 2011 11:07:55 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5931 X-Spam-Score: 3.4 (+++) X-Spam-Report: autolearn=disabled,FORGED_MUA_OUTLOOK=3.36 Subject: LF: antenna for 137kHz. Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.6 required=5.0 tests=FORGED_MUA_OUTLOOK autolearn=no version=2.63 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-aol-global-disposition: G x-aol-sid: 3039ac1d60574df09bc76a6a X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Gentlemen - some advice, please. My radio room is in a bedroom at the back of my house. Currently, I use a wire running from the bedroom up to a pole on the chimney about 35ft (10m) above ground, then to a pole at the bottom of the garden about 100ft (35m) away, then down to the bottom of the pole, where it is tied off. I tried running the wire back to the house (end not connected to anything) at about 8ft above ground (2.5m) but this runs alongside a long building with my office, with electicity cables, computers, etc, so it picked up a lot of noise. The signals seem "cleaner" when this return run is cut off. How can I improve this setup? I am thinking of pulling the far end of the wire over to the other side of the garden and running it back to the house there, probably about 10ft (3m) above ground, then back inside to make a loop. I would then have a loop aerial in a 45 degree plane, roughly. Does this sound as if it could be an improvement over my current setup? Would lifting the bottom of the loop up to be more horizintal be better or worse? Any other suggestions? My garden runs roughly East-West. Does my current "Inverted U" aerial have any directivity at this frequency (137kHz)? What would be the directivity of my proposed 45 degree loop? Thanks for any help & suggestions, Martin GW3UCJ deep in the Swansea Valley!