YO4HFU
137MHZ Quadrifilar Antenna for WEFAX



My satellite antenna (september 2007, KN45CE)


The Quadrifilar antenna is one of the best types of antennas for use in receiving polar-orbiting weather satellites.
This is the type of antenna that is actually used on the satellites themselves for transmitting the images.


NOAA-17 Antenna



Attention to polarization sense!!!
Use first image for detailes. If "coil" direction is opposite, the received signal will be almost zero.


Quadrifilar Antenna




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