Wow, here’s a homemade QuadriFilar Helix antenna for APT satellite reception. What can you do with this? Pull down weather images as satellites orbit the earth and transmit their images – here’s how it was made and some images snagged from NOAA18, NOAA17, NOAA15 and NOAA12 – Link.
Design and construction of quadrifilar helicoidal antennas – Link.
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