The DXZone.com Amateur Radio Internet Guide

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137MHz Quadrifilar Antenna

Posted:
https://www.dxzone.com/dx33857/137mh...r-antenna.html

Antennas/Quadrifilar Helix
This version of the 137MHz quadrifilar antenna for APT reception is an
adaptation from Bill Sykes and Bob Cobey Taming the QFH which appeared in
the March 1997 RIG magazine. This article contains detailed 3D pictures and
models and detailed pictures.