A Low-Noise 'Urban' 5 element LFA Yagi for 50MHz with a 5.6mtr boom

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

EZNEC files for this antenna now on the download page

NOTE: This is a concept antenna, I would recommend choosing a wide-band version in favour this this antenna

This antenna has been designed in order to minimise the upward and downward lobes typically seen the the EL plane on Yagi antennas. By doing this, a drastic reduction in pick up of unwanted noise in City locations is the result. The double bonus is the likelihood  of reducing transmitted interference too. However, this version is not a model with optimum suppression which would see a reduction in forward gain of 1dB. If you suffer with very bad noise on 70MHz and have room for an antenna of this size, Email me for details of the very high suppression version.

This antenna is available in imperial tube sizes only

Performance

Peak Gain: 11.21dBi @ 50.300MHz

Peak F/B: 25.41dB @ 50.300MHz

Performance at 50.150MHz: 11.18dBi, 30.36dB F/B, 25.35dBi F/R

SWR: Below 1.5.1 from 50MHz to 50.300MHz

Construction

This antennas has been designed using 5/8 inch elements and the loop section is made of 2 x 7/8 inch lengths with 3/4 inch sections inserted into each end in order to complete the loop. The loop is feed at the back nearest the reflector. Details of the loop layout as per picture below: