SP 111: Quadrifilar Helix Antenna (50 pts)
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How To Build A QFH (Quadrifilar Helix Antenna) to Download Images From Weather Satellites
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Quadrifilar helicoidal antenna - Javascript on-line calculator
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NOAA Satellite Signals With a PVC QFH Antenna and Laptop : 9 Steps (with Pictures) - Instructables
