DK7ZB-Style 2m/70cm Yagi Antenna (4+5 Elements)

This project contains 3D printed mechanical parts for assembling a DK7ZB-style dual-band Yagi antenna for 2 m / 70 cm, based on the 4+5 element design.

Original antenna reference:
https://www.qsl.net/dk7zb/Duoband/4+5_2m-70cm.htm

This version uses:

• square aluminum boom: 15 × 15 × 1.5 mm
• radiator tube: 12 mm
• parasitic elements: 8 mm

The printed parts were created by OK1AAP (https://www.qrz.com/db/OK1AAP)

Hardware

• element mounting screws: M4 × 35
• feed box main screw: M4 × 25
• second feed-box fastener: M4 × 35 threaded stud
• feed box screws: 4 × 2.9 × 12
• the threaded stud screws into a nylon insulating part placed between the ends of the radiator tubes

Printing recommendations

• use a UV-resistant filament for outdoor use
• I printed the parts from ABS
• the print profile uses 100% infill for maximum strength

Files included

• ready-to-print model files
• STEP files are included for custom slicing or further modifications

Important note
This upload contains mechanical parts only.
Because element diameter and spacing are critical in DK7ZB-style antennas, this design should be treated as a mechanical implementation based on the DK7ZB 4+5 concept, not automatically as an exact reproduction of the original published electrical dimensions.
Final element lengths, spacing, feed arrangement and tuning must be verified by the builder.

Credits
Mechanical 3D printed parts designed by OK1AAP.
Antenna concept based on the DK7ZB duoband Yagi 2 m / 70 cm (4+5 elements).