Parts for building QFH antenna from PVC pipes. With 3D printed parts you can build this antenna very easily. Dimensions calculator and more info about QFH antenna: http://jcoppens.com/ant/qfh/calc.en.php Central support is from 25 mm pipe and supports from 16mm pipes. You need 1 top cross holder and 4 pcs of support holder parts. There is openscad source, you can easy modify the diameters. Printed with support material.