The impedance of this antenna is around 50 Ω, so you may want to use a 1 : 1 transformer. Geometry is not that critical. If you want to put this thing outdoors, do not use brass, as it gets brittle.

As with any calculator, we double cross-checked the results. For that, a small pcb was designed. It allows for easy soldering of the rods in a well-defined geometry. As a transformer, we used a ETC1-1-13TR (1:1, 5 MHz - 3 GHz). The rods are made of copper, diameter = 3 mm.






It can be seen, that the calculated length's are approx. 5% longer than necessary. We call this tuning-reserve.

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