4El10m  
4El.15m  3El.17m 

4El.20m 
3Element17mYagi with 28 Ohm (Version 1)
Boom 5,00 m (BroadbandYagi for mounting with other antennas nearby)
(A second Yagi with 3,85 m Boom and 12,5 Ohm see down)
Dave, M0TAZ, and his team have built the Yagi and tested it on a fieldday. The beam construction really was a team effort and was made possible by Chris G8OCV, George M1GEO, 
Short data for the Yagi at the begin, in the middle part and at the end of the band
Plot with the NECIIreference of YO7.2 by K6STI
The meaning of the data : Frequency, gain, F/R, radiation resistance (impedance), SWR and loss against a theoretical defined maximumgain Yagi with the given boomlength. Remember that this gain is only available with very low impedance and extrem low bandwidth! 
Elements of the 17m28OhmYagi, lengths for one
elementhalf:

30x2mm 
25x2,00mm 
20x1,5mm 
16x1,5mm 
Position 
Ref 
0,50m 
1,35m 
1,25m 
1,165m 
0m 
Rad 
0,50m 
1,35m 
1,25m 
0,945m 
2,19m 
Dir 
0,50m 
1,35m 
1,25m 
0,675m 
4,95m 
Azimuthdiagram (horizontal pattern):
Elevationdiagram (vertical pattern):
3Element17mYagi with 12,5 Ohm (Version 2)
Boom 3,85 m, narrow band version, extreme high F/B Gain 5,4 dBd F/B > 30 dB 3dBangle hor. 64,6° 3dBangle ver. 107,8° Do not mount this Yagis with other antennas nearby. DK7ZBmatch with 2x50Ohm lambda/4 coax. 
Elements of the 17m28OhmYagi, lengths for one
elementhalf:

25x2
mm 
20x1,5 mm 
16x1 mm 
12x1 mm 
Position 
Ref 
1,00
m 
1,00
m 
1,00
m 
1,305
m 
0
m 
Rad 
1,00
m 
1,00
m 
1,00
m 
1,125
m 
1,00
m 
Dir 
1,00
m 
1,00
m 
1,00
m 
0,83 m 
3,83 m 