These are SWR charts: overall for three bands, and separate for 80 m band.

SWR for 40 and 20 m bands


Overall, this dipole noise is lower than from vertical HiQ with 102" whip. Also ambient noise was checked by the full power shutdown in the house. This is typical spectrum at my QTH on 80 m. 


40 m band noise at full powerdown:


20 m band noise at full powerdown:

Historical information about the five-band fan dipole:

It was interesting to tune the five-band fan dipole. Top 10 and 6 meters bands were operational on this antenna, as confirmed with local club members. Although during a year, not much activity was happening on those two bands. And also much more efficient directional antennas are available for 10 and 6 meters. So it was decided to cut off those wires, to make the central part lighter, and also lift it much higher with the central rope. U-type of dipole has been changed to Inverted-V Fan Dipole, which was supposed to make better coverage of areas along the dipole axis.

Final dimensions of the former 5-band dipole. Risers are those pigtail pieces of wire, connecting the wing with balun (they are included in the total length).

Band

total length for 5-band antenna, in cm

left wing

left riser

right riser

right wing

80 m

3788

1820

73

77

1818

40 m

1970

960

28

33

949
20 m

1041

473

50

42

476

10 m

526

236

27

36

227

6 m

311

101

54

50

106

Five-band Non-Inverted-U fan dipole: final design, non-operational now (click to enlarge):


Overall view of 5-bands non-inverted U fan dipole:


From another angle:


Right wing (from the back):


Central part:


Both central spacers, balun and coax have been supported by the rope and finally by the 80 m wires. In more details:


Originally, five-bands dipole has been tuned this way, this is SWR chart:

SWR for all bands and separate for 80 m:

SWR for 40 m and 20 m:

SWR for 10m and 6 m:

"Tri-band Inverted-V Fan Dipole" antenna proved to be the reliable most important part of the base station. With 100Wt Yaesu FT-991 and 500Wt Elecraft K3s it brings a lot of fun to work in competitions and everyday DXing and ragchewing.

As a future development, with the deployment of HexBeam for 20 m band and higher, maybe the central 20 m wire will be cut off from the dipole, leaving 80 and 40 meters only.

 

Few videos, demonstrating how harsh environment for this dipole could be:

Windstorms...