Off center fed multiband antenna for 40, 20, 10m + 80m shortened 4:1 400W PEP SSB



Antenna type: eccentrically fed multiband antenna for 80, 40, 20 and 10 meter bands with frequency ranges of  3500kHz to 3800kHz, 7000kHz to 7200kHz, 14000kHz to 14350kHz, and 28000kHz to 29700kHz with overall length of 20.5 meters (~ 67 ft.) (arms length: 13.65m/ ~45ft., 6.8m/ ~22ft.,3.8m/ ~12.5ft ), with gain on 40m band of 0dBd and maximum power load 400W PEP SBB with a 4:1 balun version

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84,00 €

Data sheet

Frequency range3500kHz – 3800kHz, 7000 kHz – 7200 kHz, 14000 kHz – 14350 kHz, 28000 kHz – 29700 kHz
Working band of the antennaApprox.130 kHz for SWR less than 2 (depends on the placement of the antenna in space) and approx. 70kHz for 80m
Arms length13.65m/ ~45ft., 6.8m/ ~22ft.,3.8m/ ~12.5ft
Overall length20.5 meters (~ 67 ft.)
Gain0 dBd for the 40 meter band
Maximum power load400W PEP SSB
Antenna feed50 ohm coaxial cable
Mounting heightnot less than 6 meters (~20 feet) (the higher, the better)
Weight1,4 Kg

More info

Materials used to build this antenna have been selected with an emphasis on  the best electrical and mechanical properties, and resistance against outside weather conditions. An equally important factor is the durability of these properties in the future.

Product description

For the dipole arms a hardened and prestressed copper line with a cross-section of 2,5sqmm and a harder PVC isolation is used.

On the box side of the dipole arm the wire is tipped with an eye for a M4 screw, made by ZES Dolny Kubin. It is also isolated by a shrink tube on both sides. The mechanical connection with the balun is done so using a simple wire loop secured with a wire clamp and, on the hanging rope side, a ceramic isolator (type 16C01 made by MFJ) is used.


The antenna balun (type 4:1, 400W PEP SSB) is placed in a waterproof box with  IP65 made by SCAME, type 686.205. 


On both sides of the box are screws with closed hook ends  for mechanical attachement of the dipole wire arms, the screws are of size M5, for long lasting mechanical loads.

A more solidly made  SO239 panel connector is used, with POM diaelectricum, bolted to the box with anticorrosion steel screws and nuts.


The balun transformer is wound on a ferite toroid core type AMR R4with the respective measurements of (outer x inner x height)36 x 23 x 15 mm.                    

The arms of the dipole are electrically connected to the transformer through a pair of M4 stainless steel screws and nuts on both sides of the box.




The connector on the antenna serves only to electrically connect with the coaxial cable. For bearing the coaxial cable, use the attached   rope (with inner core made by LANEX).


Tuning of the antenna for the 80m band is done by shortening the 3.8m arm. The 40, 20 and 10 m band is tuned by shortening the 13.65m arm.

The 80m band arm is tuned under the CW segment (less then 3600kHz) and it is up to the customer where he sets the arm length to the desired band segment.

After the antenna is tuned, it is required to insulate the ends of the arms with shrink tubing to prevent water intrusion.

The warranty does not cover damage caused by overloading the balun with more power than specified on the balun`s label. Also, the warranty doesn`t cover damage caused to the balun by transmitting with an unmatched antenna. The warranty is set by EU consumer rights for 2 years.

In case of a complaint the customer will need to show his receipt/invoice so please keep your proof of purchase safe, because it also serves as the warranty certificate.