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Query: yagi 21 mhz
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This document details the design and construction of a Vinecom 6N4 dual-band Yagi antenna for the 50MHz (6-meter) and 70MHz (4-meter) amateur radio bands. The antenna features 9 total elements (4 elements for 50MHz, 5 elements for 70MHz) on a 4.236-meter aluminum boom. Computer simulations using MMANA software predict 7.21 dBd gain on both bands with front-to-back ratios of 16.01dB (6m) and 15.37dB (4m). The design uses 12.7mm diameter elements mounted on a 32mm square boom, weighing 5.7kg total. Practical measurements with an MFJ-269 analyzer confirmed good SWR performance across both bands after element length adjustments.
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Cheap UHF antenna plans for 2 meters and up including 421 1296 and 902 Mhz
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The HyGain LJ-153BA a monoband 3 element Yagi, designed for the 15 m band 21.00 - 21.45 MHz
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A ten element ultra-lightweight yagi beam antenna for 144 MHz based on YU7EF design concept
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50MHz Collapsible 2 Element Mini Beam antenna, an overview the development of the 6MBA.
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2-Element-12,5-Ohm-Yagi with 0,40m-Boom complete description of all details for building this Yagi and stacking to an array
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This 10 meter antenna is right out of the ARRL Antenna Book. There are 5 elements on a 24 feet boom and it performs well from 28.0 to 28.9 MHz.