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Query: petlowany
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a simple, low-cost, trapless short vertical antenna which amazingly works on three HF bands (20, 15 and 10 meters)
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The Petlowany Three-Band Burner is a simple, low-cost, trapless short vertical antenna which amazingly works on three HF bands (20, 15 and 10 meters). This web page contains pictures, performance data, and enough construction details so you can homebrew your own.
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WorldRadio Article on Petlowany antennas base on this principle: if a length of wire is wound into a spiral-shaped coil and excited by a radio frequency current connected to the innermost portion of the coil, it will then, and only then, exhibit RF characteristics that closely approximate those of a resonant linear wire of the same length
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An attempt to modify and try out the unusual antenna first described by Bill Petlowany, K6NO, in World Radio Magazine
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Modification of the Bill Petlowany, K6NO antenna by N0LX
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Spipral antenna principle by a concept of Bill Petlowany, K6NO. Tak Antennas are based on this principle, using spirals as dipole linear wires.