Gain of this antenna with 10 elements is 15.2dBi. Since the impedance is 28Ω it must be matched with two 75Ω coaxial cables in parallel.

14 radiation pattern

Radiation pattern in Vertical plane

All elements must be insulated from the Boom with standoffs.

The table shows the data with three pipe diameters: 10mm, 8mm and 6mm, but the dipole is in all three variants with Ø10 mm (thicker pipe gives greater bandwidth of the antenna).

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