A 5 elements V-Yagi at my own QTH (19DX348)
Above the azimuth plot @ 27,555 MHz.
Above the azimuth plot @ 28 MHz
Above the azimuth pattern @28,4 MHz
Above the elevation plot @ 27,555 MHz
Above the elevation plot @ 28 MHz
Above the elevation plot @ 28,4 MHz
Above the SWR bandwidth
The Gain, Front to back and Front to rear response versus frequency
Above the elevation plot when placed 11 meters high above average flat ground conditions.
Above the elevation plot when placed 18 meters high above average flat ground conditions.
Above the antenna Q factor: Below 10 over 1 MHz bandwidth….THIS IS EXCEPTIONAL !
If the Q factor is below 15 over a wide range of frequencies above and below the operating band, these
are very good stable antennas.
Q factors between 15 and 30 over a wide range of frequencies above and below the operating range
represent acceptable values for slightly less stable antennas.
Q factors between 30 and 50 indicate that they are relatively unstable antennas, although often in some
narrow part of the range they can have a lower Q factor.
Q factors over 50, regardless of the possible narrow parts of the lower Q band, represent extremely
unstable antennas. (SOURCE: YU1AW)
For: 11 meter and 10m band
Antenna Type: 5 elements V-Yagi
Bend Radiator (k6STI)
Designed by: 19DX348 version 1.01 feb 2014
Boom length: 5,12 Meter
Gain: 9,30 dBI (@27,555 MHz, Peak gain: 9,67dBI @28,5MHz)
FB <30 dB
FR <26 dB
Impedance: 50 ohms, direct fed
SWR below 1:1.1 > 950 Khz.
SWR below 2:1 > 2100 Khz
Element Dimensions:
All sizes here provided in
The center of each element (1,6,9,14,19) is made from 25mm diameter tubing and is 2,0 Meter long.
2,3,10,11,15,16,20,21 are 20mm in diameter and are 90 cm long.
The tips of the elements: 4,5,7,8,12,13,17,18,22,23 are 16mm in diameter and make up for the rest of the element.
Do not change dimensions and be VERY precise !
ELEMENT DISTANCES and LENGHTS
Element lengths: Distances:
Reflector: 5,520 M 0,0 M
Radiator: 5,190 M 0,889/0,500M
Director 1: 4,964 M 1,738 M
Director 2: 4,964 M 2,931 M
Director 3: 4,750 M 5,120 M
Yes, director 1 and 2 have the same length.
The bend part of the radiator has a length of 1,642 meter. (tips are 0,5 meter away from the reflector)
The antenna is 50 Ohms direct fed, no machting losses
A 1;1 balun and / or RF-choke is a must on any Yagi !