A Low-Noise 6 element LFA Yagi with a 6.0 metre Boom for 50MHz
Premium commercial versions of this antenna at Innovantennas
The LFA design has a patent pending and all G0KSC designs are copyright. Any ham can build for their own use or those of a friend. Where profit or commerical gain exists, express permission of G0KSC must be sought.
If you suffer with noise from living in the city, this is another low-noise antenna from G0KSC
This antenna has been designed with performance in mind and provides optimum performance for the 6.0 metre boom length. As with all of my second generation LFA's wide bandwidth has been modelled into the antenna to ensure maximum performance without matching losses.
Please read the 'how to make the LFA Loop' page here
Installed at ZS5QM
Built and installed by ZL3ADT
HK4SAN presents his 6m long 6el 50MHz LFA before it is installed on his tower
XE1R standing proud with his 'just-built' 6.0m long 6el 50MHz LFA
The 6el 6.0m 50MHz LFA at SM0RCL
Kai, SM0RCL also fitted the G0KSC Antenna Balun too
I've used my LFA during the opening this morning to great satisfaction. I know that I could have done some
fine tuning, but this being my first Yagi, I just wanted it UP! But on the other hand, I'm quite sure that when
my Versatower gets up, it'll contain more than one of theese. And I'm really glad that you convinced me to
build the Pawsey according to the new design....
....You can consider me as one really happy user of your designs. And please feel free to use the pictures if you want to.
I could mail them to you in higher quality than the ones that I've linked to, but I'm trying to keep the webpictures somewhat
smaller for convenience and to get correct screen resolutions.'
Kai, SM0RCL
The 4.9m long 6el 70MHz LFA installed above a 50MHz version ate G8FJG - Antenna Baluns installed on both
Performance
Forward Gain: 11.21dBi at 50.150MHz
Front to Back Ratio: 31.45dB at 50.150MHz
Stacking:
Vertical Spacing: 4.7m
2 x Gain: 13.87dBi at 50.150MHz
2 x F/B: 34.53dB
Build Dimensions using 1/2 inch elements 12mm element version below
Element Spacing in metres Half element Length in metres
Reflector 0 1.487 1/2 inch elements
DE1 .300 1.258 1/2 inch elements
DE2 .824 1.258 1/2 inch elements
D1 1.276 1.4035 1/2 inch elements
D2 2.435 1.3605 1/2 inch elements
D3 4.106 1.316 1/2 inch elements
D4 6.000 1.2015 1/2 inch elements
Notes:
DE1 and DE2 are joined at the ends by either 3/8 inch tube. Adjust width of loop for best SWR
Feed point is ALWAYS the centre of DE1
Please read the 'how to make the LFA Loop' page here
Version using 12mm elements
Performance
Forward Gain: 11.20dBi at 50.150MHz
Front to Back Ratio: 32.17dB at 50.150MHz
Stacking:
Vertical Spacing: 4.7m
2 x Gain: 13.86dBi at 50.150MHz
2 x F/B: 35.45dB
Build Dimensions using 12mm elements
Element Spacing in metres Half element Length in metres
Reflector 0 1.488 12mm elements
DE1 .300 1.2615 12mm (end sections 8/10mm)
DE2 .824 1.2615 12mm (end sections 8/10mm)
D1 1.276 1.4045 12mm elements
D2 2.435 1.3615 12mm elements
D3 4.106 1.317 12mm elements
D4 6.000 1.2025 12mm elements
Notes:
DE1 and DE2 are joined at the ends by either 8mm or 10mm tube. Adjust loop width for best SWR
Feed point is ALWAYS the centre of DE1
Please read the 'how to make the LFA Loop' page in the CONSTRUCTION menu
Performance plot of this fantastic antenna
Single antenna Azimuth Plot
Single Antenna Elevation Plot
Single antenna 12m up over average ground
2 x 6el (stacked 4.7m apart) with bottom antenna at 12m up
Single Antenna SWR Plot