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were open, but because of a road it was positioned 20 feet from a dense wood. In the winter it was a great performer. As spring approached and the sap ran and leaves appeared, the performance would degrade. At first it seemed due to seasonal propagation, but I finally realized it was those darn trees. Jim > Cebik also mentions the point raised by Guy K2AV, that in the real world > there are other considerations: > > "There is a counterweight to this facet of vertical antenna behavior that is > especially apt to urban, suburban, and wooded locations. I cannot > demonstrate it with a model, but only from the collective experience of many > vertical users, including myself. The phenomenon is the dreaded "Rf-eating > shrubbery." In the open fields of America's great farming states, a > ground-mounted vertical has its best home, with nothing but open fields for > many wavelengths in any direction. In crowded locations, the presence of > significant structures--both natural and man-made--appears to prevent a > ground-mounted vertical from achieving its full performance potential. -------------------------------------------- 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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