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The use of three antennas often represents a good compromise between increased antenna gain, mechanical feasibility, and satisfactory handleability

This Quagi is optimized for 432.2Mhz operation, however it works well in a quite wide range of frequency

Boom Length 1705 mm, Elements diameter 8-10 mm, hollow material they are obstructed by the boom, adjustment stub range length from the central arm to the collection clamp 175-200 mm diameter of aluminum tube from 6 mm distance between stub and radiator 15 mm

The elements have direct connection to the supporting boom by a metal ring where on either side one half of the element is screwed

Adjust lenght of the dipole if needed important, you can also use a folded dipole with a 1:4 balun