Return-Path: Received: (qmail 15490 invoked from network); 14 Sep 1999 08:07:07 -0000 Received: from magnus.plus.net.uk (HELO magnus.force9.net) (195.166.128.27) by murphys.force9.net with SMTP; 14 Sep 1999 08:07:07 -0000 Received: (qmail 10257 invoked from network); 14 Sep 1999 08:06:24 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by magnus.plus.net.uk with SMTP; 14 Sep 1999 08:06:24 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 11QnSD-0006KT-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 14 Sep 1999 08:56:41 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: from mailserv.cc.kuleuven.ac.be ([134.58.8.44]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 11QnS9-0006KO-00 for rsgb_lf_group@blacksheep.org; Tue, 14 Sep 1999 08:56:40 +0100 Received: from LCBD15.fys.kuleuven.ac.be (LCBD15.fys.kuleuven.ac.be [134.58.80.15]) by mailserv.cc.kuleuven.ac.be (8.9.0/8.9.0) with SMTP id KAA09848 for ; Tue, 14 Sep 1999 10:02:33 +0200 Message-ID: <3.0.1.16.19990914095618.30d79f90@mail.cc.kuleuven.ac.be> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Sender: pb623250@mail.cc.kuleuven.ac.be X-Mailer: Windows Eudora Pro Version 3.0.1 (16) Date: Tue, 14 Sep 1999 09:56:18 To: rsgb_lf_group@blacksheep.org From: "Rik Strobbe" Subject: Re: LF: Advice on Antenna. In-reply-to: <199909140127_MC2-84B5-742B@compuserve.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Hi Des, In his mail Geri, DK8KW, has given a very good description of what to do. I would like just to add 2 options : 1. If it is mechanically possible you might gain some dB's by placing the loading coil (or at least a part of it) at the top of the vertical section. Especially with a rather small top-hat as you described this will increase the effeciency of the antenna. I believe that G3XDV has some experience with it. 2. Having several parallel wires in the top-hat will increase the antenna capacitance and is in some cases mechanicaly simple to implement. I use an inverted-L antenna with a 13m high vertical section and a 26m long horizontal section that consists of 4 parallel wires each 0.8m separated. 73, Rik ON7YD