Quadrifilar Helix Antenna

QFH Antennas provides circular polarization and a near hemispherical coverage. A popular usage is for satellite reception.

QFH Antennas provides good quality circular polarization and near hemispherical coverage in the VHF UHF and microwave bands, and are often used in satellite reception.
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    This article describes how to make a quadrifilar helix (QFH) antenna easily, from inexpensive materials: uPVC plumbing pipe and RG-58U co-axial cable.
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    This version of the 135MHz quadrifilar antenna for APT reception is an adaptation from Bill Sykes and Bob Cobey's article Taming the QFH which appeared in the March 1997 RIG magazine.
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  • Helical Antennas
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