Dual Band 2m/70cm 4/5 Element Yagi

I was look for a small compact dual band antenna for 2m /70cm. I came across a design by DK7ZB and can be found here http://www.qsl.net/dk7zb/Duoband/4+5_2m-70cm.htm.

Screen Shot 2017-08-05 at 1.31.39 pm

The boom is square 19mm x 1m and uses 10mm elements. The boom clamps are 3d printed using black PLA.

Screen Shot 2017-08-05 at 1.31.53 pm

Below are the measurements using 8mm and 10mm tube. The radiating element is constructed from 12mm tube for both versions.

El.-No. Element Position Length (8 mm) Length (10 mm)
1 Reflector for 2m 0 mm 1013 mm 1011 mm
2 Reflector for 70cm 110mm 343 mm 332 mm
3 Radiator 2m and 70cm 260 mm 973 mm (12 mm) 973 mm (12 mm)
4 Director 1 70cm 308 mm 319 mm 316 mm
5 Director 2 70cm 440 mm 312 mm 310 mm
6 Director 1 2m 465 mm 919 mm 911 mm
7 Director 3 70cm 750 mm 267 mm 261 mm
8 Director 4 70cm 965 mm 283 mm 278 mm
9 Director 2 2m 985 mm 879 mm 870 mm

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