VHF/UHF LFA-Yagis

2m/144MHz LFA Yagis


2m Richtantennen

LFA Yagis differs a lot from the traditional Yagi design.

The LFA ("Loop Fed Array") has a rectangular dipole with 1λ length. The dipole lies flat on the boom at the same level as the parasitic elements. The outer sides of the dipole run parallel to the boom and are designed to be exactly inversely phased (±180°).

This way signals eliminate each other on those sides resulting in much reduced side lobes, lower G/T values and a better front to back ratio.
This concept can be applied at almost any boom length. LFA Yagis have 50Ω impedance and get by without lossy transformation.

144LFA5 144LFA7 144LFA8 144LFA9 144LFA11 144LFA13 144LFA16
Elements 5 7 8 9 11 13 16
Gain [dBi] 11,12 12,81 13,29 14,16 15,29 16,04 17,45
Front/Back ratio [db] 19,76 22,44 25,69 24,13 28,59 26,4 33,7
SWR ≤ 1,4
Impedance 50Ω
Max. Power 5000 W
Boom length 1,82 2,95 3,77 4,50 6,15 7,90 10,92 m
Max. Wind Velocity ≤200 ≤200 ≤200 ≤160 ≤160 ≤160 ≤160 km/h
Weight 1,8 2,1 3,1 4,5 6,2 7,2 9,2 kg
Foremast No No No No No No No
Connector Screw terminals Screw terminals Screw terminals Screw terminals Screw terminals Screw terminals Screw terminals
Order No. 17740.V-05 17740.V-07 17740.V-08 17740.V-09 17740.V-11 17740.V-13 17740.V-16
99.00 € 137.00 € 143.00 € 182.00 € 226.50 € 269.00 € 311.00 €
Order No.
17740.V-05 144LFA5 99.00 € Buy now In stock, shipped in 1 or two days.
17740.V-07 144LFA7 137.00 € Buy now Not in stock, back on: 15. Dez. 2017
17740.V-08 144LFA8 143.00 € Buy now Not in stock, back in 40 days.
17740.V-09 144LFA´9 182.00 € Buy now In stock, shipped in 1 or two days.
17740.V-11 144LFA11 226.50 € Buy now Not in stock, back in 40 days.
17740.V-13 144LFA13 269.00 € Buy now In stock, shipped in 1 or two days.
17740.V-16 144LFA16 311.00 € Buy now Not in stock, back in 40 days.
Info freight charges

Cross Yagi (LFA) for 2m

16+16 LFA

Our 2m, 2x16ele LFA crossed yagi attached to a 13m dish at the EME 2014 conference in Pleumeur-Bodou (France). After the QSOs it was a gift and the first prize of a lotery among all attendants of the conference.

16+16 LFA 11+11 LFA
Elements 16+16 11+11
Frequency Range 144.0 - 144.5 MHz
Gain 17.54 15.24 dBi
Front/Back ratio 34.42 38.78 dB
SWR 1,2:1 - 1,3:1 1,1:1 - 1,2:1
Impedance 50 Ω
Max. Power 10 kW*
Boom length 11.17 6.44 m
Max. rotating radius 5.60 3.31 m
Max. Wind Velocity ≥ 160 km/h
Weight 20 14.5 kg
Foremast No
Connector Screw terminals
Packing size 17 x 11 x 255 17 x 11 x 255 cm
Order No. 17740.VX-32 17740.VX-22
396.00 € 330.00 €
Order No.
17740.VX-32 EAntenna 16+16 LFA 396.00 € Buy now In stock, shipped in 1 or two days.
17740.VX-22 EAntenna 11-11 LFA 330.00 € Buy now Not in stock, ordered only on customer request, delay at c. 40 days.
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70cm/430MHz LFA-Yagis


70cm directional antenna

As with the 2m antennas, 430MHz directional antennas are manufactured according to the LFA concept.

432LFA15 432LFA18 432LFA23 432LFA30
Elements 15 18 23 30
Gain 15,69 18,01 19,15 20,45 dBi
Front/Back ratio 32,87 42,32 37,48 44,32 dB
SWR ≤2 ≤2 ≤2 ≤2
Impedance 50Ω 50Ω 50Ω 50Ω
Max. Power 5000 5000 5000 5000 W
Boom length 3,22 4,30 5,90 8,25 m
Max. Wind Velocity ≤200 ≤160 ≤160 ≤160 km/h
Weight 3,8 4,1 4,9 6,9 kg
Foremast No No No No
Connector Screw terminals Screw terminals Screw terminals Screw terminals
Order No. 17740.U-15 17740.U-18 17740.U-23 17740.U-30
Price 146.00 € 176.00 € 246.00 € 275.00 €
Order No.
17740.U-15 EAntenna 432LFA15 146.00 € Buy now Not in stock, ordered only on customer request, delay at c. 40 days.
17740.U-18 EAntenna 432LFA18 176.00 € Buy now Not in stock, ordered only on customer request, delay at c. 40 days.
17740.U-23 EAntenna 432LFA23 246.00 € Buy now In stock, shipped in 1 or two days.
17740.U-30 EAntenna 432LFA30 275.00 € Buy now In stock, shipped in 1 or two days.
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144MHz/430MHz Duoband directional antennas DK7ZB Design


Duoband directiona antennas

Duoband antennas consist of two monoband antennas that are nested in each other on a single boom. Therefore only one coax cable is required for feeding.

EA270ZB9 EA270ZB13
Frequency Range [MHz] 144-146 432-440 144-146 432-440
Elements 4 5 5 8
Gain 9,35 10,7 10,8 11,0 dBi
Front/Back ratio 11,7 9,7 18,7 15,4 dB
SWR ≤1,5 ≤1,5 ≤1,5 ≤1,5
Impedance 50 50 50 50 Ω
Max. Power 500 500 500 500 W
Boom length 1,20 1,51 m
Foremast Yes No
Connector Screw terminals Screw terminals Screw terminals Screw terminals
Weight 1,25 1,37 kg
Order No. 17740.D4-5 17740.D5-8
Price 69.00 € 83.00 €
Order No.
17740.D4-5 EAntenna EA270ZB9 69.00 € Buy now Not in stock, back on: 15. Dez. 2017
17740.D5-8 EAntenna EA270ZB13 83.00 € Buy now In stock, shipped in 1 or two days.
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50MHz/70MHz/144MHz directional antenna


50MHz/70MHz/144MHz directional antenna

Cover 3 VHF-bands with only one antenna. All elements are at same level on a common boom. The gaps between elements are design to produce high gain as well as very good F/B ratio. The antenna, built in DK7ZB-design, has a light weighted so that even low-priced TV antenna rotors can turn it without any problems.

EA642ZB7
Frequency Range 50-51 70-70,5 144-146 MHz
Elements 2 2 3
Gain 6,7 6,5 7,7 dBi
Front/Back ratio 8,6 11 10,8 dB
SWR ≤1,3 ≤1,3 ≤1,3 ≤1,3
Impedance 50 50 50 Ω
Max. Power 500 500 500 W
Boom length 1,25 1,25 1,25 m
Foremast No No No
Connector Screw terminals Screw terminals Screw terminals
Weight 1,82 1,82 1,82 kg
Order No. 17740.T2-2-3 17740.T2-2-3 17740.T2-2-3
Price 121.00 €
Order No.
17740.T2-2-3 EAntenna EA642ZB7 121.00 € Buy now In stock, shipped in 1 or two days.
Info freight charges

6m/50MHz LFA directional antenna


6m directional antenna

As with the 2m antennas, 50MHz directional antennas are manufactured according to the LFA concept.

50LFA3 50LFA4 50LFA5S 50LFA5 50LFA6XL 50LFA7 50LFA8
Elements 3 4 5 5 6 7 8
Gain 8,63 9,36 10,78 10,61 12,33 12,89 14,10 dBi
Front/Back ratio 20,79 23,46 26,49 24,83 22,6 32,89 28,95 dB
SWR ≤ 1,04 ≤ 1,04 ≤ 1,04 ≤ 1,04 ≤ 1,04 ≤ 1,04 ≤ 1,04
Impedance 50 50 50 50 50 50 50 Ω
Max. Power 5000 5000 5000 5000 5000 5000 5000 W
Boom length 1,95 3,00 3,95 4,48 7,30 9,40 12,58 m
Max. rotating radius 1,40 1,55 2,49 2,30 3,70 4,75 6,95 m
Max. Wind Velocity ≤200 ≤200 ≤200 ≤160 ≤160 ≤160 130 km/h
Weight 3,0 4,0 4,9 5,4 9,0 9,5 17,0 kg
Foremast No No No No No No No
Connector Screw terminals Screw terminals Screw terminals Screw terminals Screw terminals Screw terminals Screw terminals
Order No. 17740.6-3 17740.6-4 17740.6-5S 17740.6-5 17740.6-6XL 17740.6-7 17740.6-8
Price 139.00 € 176.00 € 209.00 € 209.00 € 352.00 € 418.00 € 555.00 €
Order No.
17740.6-3 EAntenna 50LFA3 139.00 € Buy now Not in stock, back in 40 days.
17740.6-4 EAntenna 50LFA4 176.00 € Buy now In stock, shipped in 1 or two days.
17740.6-5S EAntenna 50LFA5S 209.00 € Buy now In stock, shipped in 1 or two days.
17740.6-5 EAntenna 50LFA5 209.00 € Buy now In stock, shipped in 1 or two days.
17740.6-6XL EAntenna 50LFA6XL 352.00 € Buy now Not in stock, ordered only on customer request, delay at c. 40 days.
17740.6-7 EAntenna 50LFA7 418.00 € Buy now Not in stock, ordered only on customer request, delay at c. 40 days.
17740.6-8 EAntenna 50LFA8 555.00 € Buy now In stock, shipped in 1 or two days.
Info freight charges