The InnovAntennas 88-DES-14 is a 14-element Yagi on a 219″ boom. The driven element ends are bent.
I modeled the antenna with the AO 9.53 Antenna Optimizer program. This image shows the antenna geometry. The red dot is the 75Ω feedpoint.
Wes Tewmey assembled this antenna in Watertown, Tennessee.
The driven element length is adjustable. I used the "starting point" length from the assembly manual. I did not model dielectric loss or loading due to the plastic end caps all elements use.
Click pattern to denormalize
Calculated performance is for 28 analysis segments per conductor halfwave. Forward gain includes mismatch and conductor losses. F/R is the ratio of forward power to that of the worst backlobe in the rear half-plane.
Frequency Impedance SWR Mismatch Conductor Forward F/R
MHz ohms Loss dB Loss dB Gain dBd dB
88 56.4+j11.0 1.39 0.12 0.02 7.75 16.91
89 71.8+j11.5 1.18 0.03 0.01 7.91 20.91
90 83.2+j7.5 1.15 0.02 0.01 7.99 25.66
91 89.7+j2.3 1.20 0.04 0.01 8.06 26.94
92 92.6-j1.8 1.24 0.05 0.01 8.16 26.18
93 93.2-j4.6 1.25 0.05 0.01 8.30 25.69
94 92.4-j5.5 1.24 0.05 0.01 8.47 24.79
95 91.5-j4.7 1.23 0.05 0.01 8.67 24.18
96 90.9-j3.0 1.22 0.04 0.01 8.89 23.91
97 91.0-j0.8 1.21 0.04 0.01 9.12 23.98
98 91.7+j1.0 1.22 0.04 0.01 9.36 22.89
99 92.6+j1.7 1.24 0.05 0.01 9.60 21.53
100 92.6+j1.1 1.24 0.05 0.02 9.86 20.55
101 90.4-j1.0 1.21 0.04 0.02 10.12 19.99
102 85.9-j1.2 1.15 0.02 0.02 10.39 19.97
103 79.1+j0.8 1.06 0.00 0.03 10.63 20.49
104 72.9+j6.1 1.09 0.01 0.03 10.83 21.59
105 69.7+j13.1 1.22 0.04 0.04 10.94 22.55
106 70.8+j19.2 1.31 0.08 0.05 10.97 23.00
107 75.1+j20.0 1.31 0.08 0.07 10.91 22.83
108 85.0+j7.8 1.17 0.03 0.11 10.73 22.39
InnovAntennas 14-Element Yagi Free Space Symmetric 98 MHz 18 6063-T832 wires, inches x1 = 0 ; reflector position t2 = 4.6875 ; DE tip position x2 = 14 ; DE position x3 = 17.25 ; director positions x4 = 24.5 x5 = 38.375 x6 = 54 x7 = 73.625 x8 = 94.5 x9 = 115.375 x10 = 135.375 x11 = 158.125 x12 = 176.625 x13 = 199 x14 = 218.625 y1 = 31.875 ; reflector half-length u2 = 21.875 ; DE fixed-section half-length v2 = 46.22/2 + 0.1875 ; DE adjustable-section half-length y3 = 26.125 ; director half-lengths y4 = 26 y5 = 25.125 y6 = 24 y7 = 23.875 y8 = 23.5 y9 = 22.375 y10 = 22.5 y11 = 22 y12 = 21.5 y13 = 21.25 y14 = 20.75 1 x1 y1 0 x1 -y1 0 0.375 1 x2 u2 0 x2 -u2 0 0.5 1 x2 u2 0 x2 v2 0 0.375 1 x2 v2 0 t2 v2 0 0.375 1 x2 -u2 0 x2 -v2 0 0.375 1 x2 -v2 0 t2 -v2 0 0.375 1 x3 y3 0 x3 -y3 0 0.375 1 x4 y4 0 x4 -y4 0 0.375 1 x5 y5 0 x5 -y5 0 0.375 1 x6 y6 0 x6 -y6 0 0.375 1 x7 y7 0 x7 -y7 0 0.375 1 x8 y8 0 x8 -y8 0 0.375 1 x9 y9 0 x9 -y9 0 0.375 1 x10 y10 0 x10 -y10 0 0.375 1 x11 y11 0 x11 -y11 0 0.375 1 x12 y12 0 x12 -y12 0 0.375 1 x13 y13 0 x13 -y13 0 0.375 1 x14 y14 0 x14 -y14 0 0.375 1 source Wire 2, center
88–108 MHz