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I would expect that another way to gain better low-angle would be to elevate the antenna more than just a minimum above the ground. This, if I have read the theory right, would lessen the ground loss in the near field, thus providing better radiation at angles closer to the ground. It will be interesting. I have one on order. 73 --- Mac, K2GKK/5 Oklahoma City, OK ----Original Message Follows---- From: "Lloyd A. Bartlett" <lloydbartlett@earthlink.net> To: <Force12Talk@qth.com> Subject: [Force 12 Talk] Sigma-5 Date: Sun, 28 Apr 2002 09:01:39 -0700 Force 12 states : "SIGMA-5 efficiency is independent of the ground. To enhance the low angle energy, one can add an extensive ground screen (dense for 20-30') under the antenna (then more screen or wires out to perhaps 5 wavelengths)." I would like to hear from those who do, and those who don't use ground systems with Sigma-5. 73, Lloyd, K7CIX -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force12 Web Site: http://www.force12inc.com To Submit Message to the List: Force12Talk@qth.com To unsubscribe and view the Message Archive: see http://qth.com/force12/list For problems with the list: contact n4zr@qth.com _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force12 Web Site: http://www.force12inc.com To Submit Message to the List: Force12Talk@qth.com To unsubscribe and view the Message Archive: see http://qth.com/force12/list For problems with the list: contact n4zr@qth.com |
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