Head's up there are different Yagi calculators out there, which give significantly different values for element lengths and positions with the same design inputs. This 3D print disagrees with the online calculator https://www.changpuak.ch/electronics/yagi_uda_antenna_DL6WU.php, but agrees nicely with VK5DJ's YAGI CALCULATOR:

Yagi design frequency =2425.00 MHz (I prefer lower portion of band, 3D Print design was probably for 2450 MHz)
Wavelength =124 mm
Parasitic elements fastened to a non-metallic or separated from boom
Folded dipole fully insulated from boom
Director/reflector diam =1 mm

REFLECTOR
60.1 mm long at boom position = 30 mm (IT = 19.5 mm)

RADIATOR
Single dipole 57.8 mm tip to tip, spaced 24.7 mm from reflector at boom position 54.7 mm (IT = 18.5 mm)

DIRECTORS
Dir Length Spaced Boom position IT Gain Gain
(no.) (mm) (mm) (mm) (mm) (dBd) (dBi)
1 53.1 9.3 64.0 16.0 4.8 6.9
2 52.4 22.3 86.2 15.5 6.5 8.6
3 51.8 26.6 112.8 15.5 7.8 9.9
4 51.3 30.9 143.7 15.0 8.9 11.0
5 50.8 34.6 178.4 15.0 9.8 11.9

COMMENTS
The abbreviation "IT" means "Insert To", it is the construction distance from the element tip to the edge of the boom for through boom mounting

Spacing measured centre to centre from previous element
Tolerance for element lengths is +/- 0 mm

Boom position is the mounting point for each element as measured from the rear of the boom and includes the 30 mm overhang.The total boom length is 208 mm including two overhangs of 30 mm

The beam's estimated 3dB beamwidth is 52 deg

Here is for 2mm elements (12-gauge copper house wiring):
Director/reflector diam =2 mm

REFLECTOR
59.7 mm long at boom position = 30 mm (IT = 19.5 mm)

RADIATOR
Single dipole 57.8 mm tip to tip, spaced 24.7 mm from reflector at boom position 54.7 mm (IT = 18.5 mm)

DIRECTORS
Dir Length Spaced Boom position IT Gain Gain
(no.) (mm) (mm) (mm) (mm) (dBd) (dBi)
1 51.2 9.3 64.0 15.0 4.8 6.9
2 50.5 22.3 86.2 14.5 6.5 8.6
3 49.8 26.6 112.8 14.5 7.8 9.9
4 49.2 30.9 143.7 14.0 8.9 11.0
5 48.6 34.6 178.4 14.0 9.8 11.9

directional YAGI WLAN Antenna EXTENSION for 2.4 GHz

directional YAGI WLAN Antenna EXTENSION for 2.4 GHz

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