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This 50 ohm impedance antenna, when powered with 25-100W of RF in SSB, joins the Molniya orbiting satellites as AO-40 and AO-10

Quadrifilar helix antennas are also called fractional turn helix is very appealing to spacecraft applications

In the practical construction of a half-turn quadrifilar helix it is especially important to respect the exact lengths of the helical wires

How to make a quadrifilar helix QFH antenna easily from inexpensive materials PVC plumbing pipe and RG-58U co-axial

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