QFH 137MHz Antenna

This is a quadrifilar helicoidal antenna structure serving as a base for building a 137MHz NOAA satellite reception antenna.

Computations were done using Mr. John Coppens QFH antenna online calculator (thank you very much!) :
http://www.jcoppens.com/ant/qfh/calc.en.php

Edit 2015-04-11 :
- Added a picture received today with the antenna (no amplifier, only the antenna connected to the SDR RTL2832U dongle :-) )