BV105CA.YW, optimized Hy-Gain 105BA 28.000 28.400 29.000 28.500 MHz 5 elements, inches 1.045 0.875 0.625 0.438 0.000 2.500 41.500 21.500 44.250 40.000 3.250 20.750 23.500 53.625 80.000 2.500 21.500 23.500 52.500 169.500 2.500 21.500 23.500 50.500 281.750 2.500 21.500 23.500 44.750 The element taper is that of the Hy-Gain 105BA. Note that the 1.045" o.d. section is modeling the element clamp and boom, and that the length of the 0.875" section is shortened by the length of the 1.045" section. This design was optimized for F/R over band > 20 dB, and SWR over the band < 2:1, with a mid-band free- space gain of 10.1 dBi. Torque compensator is 2.5" OD PVC, 30.5 " long, mounted 12" behind Director 3, on flat metal plate with U-bolts. Match frequency: 28.5 MHz Driven-element tip: 53.625 inches Cable Z0: 50.0 ohms Hairpin rod diameter: 0.25 inches Hairpin rod spacing: 6.0 inches Hairpin inductance = 0.32 uH Hairpin length = 7.98 inches