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be for the bottom of a Force-12 Sigma 5. Based on a vertical dipole for 20M, the base height would be best at 5 - 6'. This would give me a 15 degree takeoff angle, and low TO angle (in my opinion) is what the Sigma series vertical dipoles offer that make them such great antennas. Its not their pattern or gain . . . per se. Mine is on the side slope of a hill with the hill to the East of the antenna. It seems as though I am getting an advantage and some directivity - I usually snag anything in the Southwest Long Path direction with a single call, where it takes quite a few more calls going short path over the Northeast. I used a Sigma 40XK this winter to work 130 30M entities and 128 40M CW entities during the gray lines - all in about 1 month! Am I just imagining things or does the side of a steep hill affect the pattern? Finally, I have a long piece if aluminum that goes below the base all the way down into water - which is the current water table in our rain soaked clay hill. Is it my imagination, or am I getting a really good reflective effect off the water table? I guess I am trying to really understand how I am breaking pileups to guys like S05X, TY5ZR and JY9QJ - all in areas that are "difficult" for West Coast stations to snag - due to the Eastern US aluminum curtain and EU. I am running 400W when I bust these huge pileups. In fact, the Sigma 5 runs rings around my MA5B minibeam (pun intended). Rich KY6R -------------------------------------------- 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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