A High-Gain 6 element LFA Yagi with a 6.4 metre Boom for 50MHz

Revised 22nd January 2010 V1.0

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 sort. 

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 6.4 metre boom length. As with all of my second generation LFA's wide bandwidth has been modeled into the antenna to ensure maximum performance without matching losses.

Please read the 'how to make the LFA Loop' page here

The current G0KSC 50MHz Antenna, the 7.3 mtr long 6el LFA - 28th July 2009

The same antenna built by VK4DDC

Performance                               

Forward Gain:                                   11.63dBi at 50.150MHz                

Front to Back Ratio:                           32.27dB at 50.150MHz              

Peak Gain:                                        11.69dBi                                    

Peak F/B:                                          32.43dB                                    

Build Dimensions using 1/2 inch or 13mm elements

Element                             Spacing in metres                                Half element Length in metres

Reflector                                0                                                                       1.490                3/8 inch or 10mm elements

DE1                                       .298                                       (1.245)                 1.246              1/2 inch  (12mm)           

DE2                                       .823                                      (1.245)                  1.246              1/2 inch  (12mm)

D1                                        1.428                                                                 1.3875                3/8 inch or 10mm elements

D2                                        2.784                                                                 1.3485                3/8 inch or 10mm elements

D3                                        4.561                                                                 1.322                  3/8 inch or 10mm elements

D4                                        6.399                                                                 1.2425                3/8 inch or 10mm elements

Notes:

DE1 and DE2 are joined at the ends by either 3/8 inch or 10mm tube when 1/2 inch or 13/12mm DE1 and DE2 are used. these end sections should be

Feed point is ALWAYS the centre of DE1

Please read the 'how to make the LFA Loop' page here

Performance plot of this fantastic antenna

Excellent elevation plot too

Antenna layout showing the feedpoint (red circle) at the back of the loop closest to the reflector

 SWR Plot