Construction Details

2-El.-10m-50Ohm

2-El.-12m-12Ohm

2-El-12m-28Ohm

Dualband 12/17m

2-El.-15m-50Ohm

2-El.-17m-28Ohm

2-El.-20m-28Ohm

2-El.-30m-28Ohm

Dualband 10/15m

2-Element-15m-Yagi with 28Ohm (Ref-Rad)

MHz 21,0 21,2 21,4
Gain 4,5dBd 4,2dBd 4,0dBd
F/B 10dB

The 2-El.-15m-Yagi built 

by  Attila, DL1NUX

A very interesting report about the construction of this antenna with many pictures on his homepage:

LINK

Dimensions of the 15m-Yagi, 28Ohm, Radiator-Reflector

Elements ( 1 half)

25x2mm

20x2mm

16x1,5mm

Position

Reflector

1,00m

1,50m

1,11m

0m

Radiator

1,00m

1,50m

0,845m

1,61m

Free space patterns:

Azimuth 21,2MHz Elevation 21,2MHz