K3LR has implemented a 4 element design on the same boom length that solves the VSWR bandwidth problem of a 3 element 40M Yagi. I have not yet added a fourth element to my 40M Yagis, but a candidate design is included at the end of this e-mail, as a YO file. This design clearly demonstrates the excellent VSWR performance improvement resulting from the addition of a fourth element on the same boomlength. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - W3LPL Wideband 4 Element 40M Yagi Height 2280.000 7.000 7.100 7.300 7.100 MHz 4 elements, inches 2.0000 1.8750 1.7500 1.6250 1.5000 1.3750 1.2500 1.1250 1.0000 0.0000 72.0000 121.5000 16.5000 16.5000 17.0000 17.5000 18.0000 18.0000 134.0000 234.7897 72.0000 121.5000 16.5000 16.5000 17.0000 17.5000 18.0000 18.0000 120.0000 317.9102 72.0000 121.5000 15.0000 15.5000 16.0000 16.0000 16.5000 17.0000 117.0000 564.0000 72.0000 96.0000 15.0000 15.5000 16.0000 16.0000 16.5000 17.0000 125.0000 This design illustrates how a 4th element radically improves the bandwidth of a 40M Yagi (thanx K3LR !) Use the H key to set the elevation angle to 10 degrees. Use the M and Tab keys to enter the following T-match parameters: Rod Diameter 0.5" Rod Spacing 10" Rod Length 144" Lead Length 6" Series Cap 99999 pf Feed Z 200 ohms Experience indicates that the driven element tip must be lengthened to 134 inches, the length that produces a modelled impedance of +j20 at 7.15 MHz.