This e-mail contains the YO file for the 5 element 20M Yagi on a 48 foot boom at W3LPL. Five of these antennas have been in use for the last several years at 50, 100 and 200 feet; operated individually and in stacked pairs. This design provides an excellent compromise between gain, front/back ratio and VSWR across the entire band while avoiding a low feedpoint impedance often found in other designs. 73 Frank W3LPL donovanf@sgate.com - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - W3LPL 5 Element 20M Yagi 48 Ft Boom (as built) Height 2340.000 14.000 14.200 14.350 MHz 5 elements, inches 1.2500 1.1250 1.0000 0.8750 0.7500 0.0000 33.7500 50.2500 33.0000 33.0000 67.0000 86.0000 33.7500 50.2500 33.0000 33.0000 52.0000 171.0000 22.0000 47.8750 33.0000 33.0000 64.0000 349.0000 22.0000 31.2500 33.0000 33.0000 77.0000 570.0000 22.0000 43.7500 33.0000 33.0000 52.0000 Use the M and Tab keys to enter the following T-match parameters: Rod diameter: 0.5" Rod Spacing: 6" Rod Length: 48" Lead Length: 3" Series Cap: 99999 pf Feed Z 200 ohms Experience indicates that the driven element tip must be lengthened to 62 inches, the length that produces a modelled impedance of +j20 ohms at 14.200 MHz