Meshtastic lora yagi antenna 868mhz

4 element version has approximately 6db gain and 6 element extended version has 9db gain.

Basic building guide:

Use copper wire approximately 1.2 mm thick for the elements. If necessary, use a 1–1.5 mm drill bit to clear out the holes for the elements. Make a small Z-shaped bend in the middle of each element.

Insert the elements into the Yagi frame. Check the lateral alignment of the elements. Install the Yagi’s dipole section. Solder the coaxial cable to the dipole, and secure the cable to the Yagi frame using cable ties. You may also use snap-on ferrites as close to the dipole feed point as possible, though this is optional. Attach the antenna to the mount; depending on which mount you choose, secure the connection with a cable tie, or thread a wire through the hole at the rear of the antenna and tie it to the hole in the mount. With the latter method, you can point the antenna up or down.

I printed everything with 4 wall lines and 7% infill. PLA works well for indoor use. The elements should be made of copper, and their lengths should be close to the values in here; the exact thickness is not critical.

If you want more gain, build an extension section for the Yagi in the same manner and carefully attach it. If the extension is loose, place a piece of tissue between the yagi and the extension. The spacing between the elements is already set on the boom. These dimensions are the actual measurements taken from a tuned antenna. If you have an antenna analyzer, leave the dipole wires about 5 mm longer and use the analyzer to tune the dipole to the correct resonant frequency.

Element lengths:

Reflector Length : 166 mm

Dipole Length : one element 82mm total length 164mm

Director 1 Length : 157 mm

Director 2 Length : 155 mm

Director 3 Length : 154 mm

Director 4 Length : 153 mm

If you do this, please share a photo with me. 73 and happy building!