---- Log_Spiral_f_lo_13.500.ant ---- Oct 18, 2020 07:02:59
Spiral Antenna, Iteration f_lo = 13.5
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 379
 
Freq: 21 MHz
Wire/Structure Loss: 1.13% 
Source  Zr/Zi: 1777.4, -j549.9 ohms
 SWR:  2.22:1
Maxgain: 6.12 dBi at 0 Azim
         6.12 dBi at 15.1 Elev
F/R: 3.32 dB dB (F/B: 0 dB ;0 dB at 165 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_13.700.ant ---- Oct 18, 2020 07:03:03
Spiral Antenna, Iteration f_lo = 13.7
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 359
 
Freq: 21 MHz
Wire/Structure Loss: 1.12% 
Source  Zr/Zi: 1527.6, +j633.2 ohms
 SWR:  2.1:1
Maxgain: 5.09 dBi at 182 Azim
         5.09 dBi at 12.6 Elev
F/R: 3.18 dB dB (F/B: 0.03 dB ;0.03 dB at 167 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_13.900.ant ---- Oct 18, 2020 07:03:06
Spiral Antenna, Iteration f_lo = 13.9
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 359
 
Freq: 21 MHz
Wire/Structure Loss: 1.12% 
Source  Zr/Zi: 1527.6, +j633.2 ohms
 SWR:  2.1:1
Maxgain: 5.09 dBi at 182 Azim
         5.09 dBi at 12.6 Elev
F/R: 3.18 dB dB (F/B: 0.03 dB ;0.03 dB at 167 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_14.100.ant ---- Oct 18, 2020 07:03:10
Spiral Antenna, Iteration f_lo = 14.1
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 341
 
Freq: 21 MHz
Wire/Structure Loss: 1.02% 
Source  Zr/Zi: 784.2, +j507 ohms
 SWR:  1.84:1
Maxgain: 5.97 dBi at 183 Azim
         5.97 dBi at 14.5 Elev
F/R: 3.59 dB dB (F/B: 0.08 dB ;0.08 dB at 166 El)
Total Loss: 0.04 dB (Efficiency: 99%)

---- Log_Spiral_f_lo_14.300.ant ---- Oct 18, 2020 07:03:13
Spiral Antenna, Iteration f_lo = 14.3
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 341
 
Freq: 21 MHz
Wire/Structure Loss: 1.02% 
Source  Zr/Zi: 784.2, +j507 ohms
 SWR:  1.84:1
Maxgain: 5.97 dBi at 183 Azim
         5.97 dBi at 14.5 Elev
F/R: 3.59 dB dB (F/B: 0.08 dB ;0.08 dB at 166 El)
Total Loss: 0.04 dB (Efficiency: 99%)

---- Log_Spiral_f_lo_14.500.ant ---- Oct 18, 2020 07:03:16
Spiral Antenna, Iteration f_lo = 14.5
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 341
 
Freq: 21 MHz
Wire/Structure Loss: 1.02% 
Source  Zr/Zi: 784.2, +j507 ohms
 SWR:  1.84:1
Maxgain: 5.97 dBi at 183 Azim
         5.97 dBi at 14.5 Elev
F/R: 3.59 dB dB (F/B: 0.08 dB ;0.08 dB at 166 El)
Total Loss: 0.04 dB (Efficiency: 99%)

---- Log_Spiral_f_lo_14.700.ant ---- Oct 18, 2020 07:03:19
Spiral Antenna, Iteration f_lo = 14.7
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 323
 
Freq: 21 MHz
Wire/Structure Loss: 0.88% 
Source  Zr/Zi: 561.1, +j158.3 ohms
 SWR:  1.68:1
Maxgain: 7.59 dBi at 182 Azim
         7.59 dBi at 17 Elev
F/R: 4.08 dB dB (F/B: 0.03 dB ;0.03 dB at 163 El)
Total Loss: 0.04 dB (Efficiency: 99.1%)

---- Log_Spiral_f_lo_14.900.ant ---- Oct 18, 2020 07:03:23
Spiral Antenna, Iteration f_lo = 14.9
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 323
 
Freq: 21 MHz
Wire/Structure Loss: 0.88% 
Source  Zr/Zi: 561.1, +j158.3 ohms
 SWR:  1.68:1
Maxgain: 7.59 dBi at 182 Azim
         7.59 dBi at 17 Elev
F/R: 4.08 dB dB (F/B: 0.03 dB ;0.03 dB at 163 El)
Total Loss: 0.04 dB (Efficiency: 99.1%)

---- Log_Spiral_f_lo_15.100.ant ---- Oct 18, 2020 07:03:25
Spiral Antenna, Iteration f_lo = 15.1
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 323
 
Freq: 21 MHz
Wire/Structure Loss: 0.88% 
Source  Zr/Zi: 561.1, +j158.3 ohms
 SWR:  1.68:1
Maxgain: 7.59 dBi at 182 Azim
         7.59 dBi at 17 Elev
F/R: 4.08 dB dB (F/B: 0.03 dB ;0.03 dB at 163 El)
Total Loss: 0.04 dB (Efficiency: 99.1%)

---- Log_Spiral_f_lo_15.300.ant ---- Oct 18, 2020 07:03:28
Spiral Antenna, Iteration f_lo = 15.3
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 307
 
Freq: 21 MHz
Wire/Structure Loss: 0.79% 
Source  Zr/Zi: 537.5, -j155.3 ohms
 SWR:  1.75:1
Maxgain: 8.68 dBi at 180 Azim
         8.68 dBi at 18 Elev
F/R: 4.29 dB dB (F/B: 0.01 dB ;0.01 dB at 162 El)
Total Loss: 0.03 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_15.500.ant ---- Oct 18, 2020 07:03:31
Spiral Antenna, Iteration f_lo = 15.5
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 307
 
Freq: 21 MHz
Wire/Structure Loss: 0.79% 
Source  Zr/Zi: 537.5, -j155.3 ohms
 SWR:  1.75:1
Maxgain: 8.68 dBi at 180 Azim
         8.68 dBi at 18 Elev
F/R: 4.29 dB dB (F/B: 0.01 dB ;0.01 dB at 162 El)
Total Loss: 0.03 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_15.700.ant ---- Oct 18, 2020 07:03:35
Spiral Antenna, Iteration f_lo = 15.7
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 307
 
Freq: 21 MHz
Wire/Structure Loss: 0.79% 
Source  Zr/Zi: 537.5, -j155.3 ohms
 SWR:  1.75:1
Maxgain: 8.68 dBi at 180 Azim
         8.68 dBi at 18 Elev
F/R: 4.29 dB dB (F/B: 0.01 dB ;0.01 dB at 162 El)
Total Loss: 0.03 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_15.900.ant ---- Oct 18, 2020 07:03:38
Spiral Antenna, Iteration f_lo = 15.9
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 307
 
Freq: 21 MHz
Wire/Structure Loss: 0.79% 
Source  Zr/Zi: 537.5, -j155.3 ohms
 SWR:  1.75:1
Maxgain: 8.68 dBi at 180 Azim
         8.68 dBi at 18 Elev
F/R: 4.29 dB dB (F/B: 0.01 dB ;0.01 dB at 162 El)
Total Loss: 0.03 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_16.100.ant ---- Oct 18, 2020 07:03:41
Spiral Antenna, Iteration f_lo = 16.1
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 291
 
Freq: 21 MHz
Wire/Structure Loss: 0.75% 
Source  Zr/Zi: 643.4, -j462.5 ohms
 SWR:  1.98:1
Maxgain: 9.11 dBi at 0 Azim
         9.11 dBi at 18.3 Elev
F/R: 4.33 dB dB (F/B: 0 dB ;0 dB at 162 El)
Total Loss: 0.03 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_16.300.ant ---- Oct 18, 2020 07:03:44
Spiral Antenna, Iteration f_lo = 16.3
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 291
 
Freq: 21 MHz
Wire/Structure Loss: 0.75% 
Source  Zr/Zi: 643.4, -j462.5 ohms
 SWR:  1.98:1
Maxgain: 9.11 dBi at 0 Azim
         9.11 dBi at 18.3 Elev
F/R: 4.33 dB dB (F/B: 0 dB ;0 dB at 162 El)
Total Loss: 0.03 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_16.500.ant ---- Oct 18, 2020 07:03:47
Spiral Antenna, Iteration f_lo = 16.5
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 291
 
Freq: 21 MHz
Wire/Structure Loss: 0.75% 
Source  Zr/Zi: 643.4, -j462.5 ohms
 SWR:  1.98:1
Maxgain: 9.11 dBi at 0 Azim
         9.11 dBi at 18.3 Elev
F/R: 4.33 dB dB (F/B: 0 dB ;0 dB at 162 El)
Total Loss: 0.03 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_16.700.ant ---- Oct 18, 2020 07:03:50
Spiral Antenna, Iteration f_lo = 16.7
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 275
 
Freq: 21 MHz
Wire/Structure Loss: 0.78% 
Source  Zr/Zi: 956.1, -j777.8 ohms
 SWR:  2.27:1
Maxgain: 8.95 dBi at 0 Azim
         8.95 dBi at 18.3 Elev
F/R: 4.27 dB dB (F/B: 0 dB ;0 dB at 162 El)
Total Loss: 0.03 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_16.900.ant ---- Oct 18, 2020 07:03:53
Spiral Antenna, Iteration f_lo = 16.9
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 275
 
Freq: 21 MHz
Wire/Structure Loss: 0.78% 
Source  Zr/Zi: 956.1, -j777.8 ohms
 SWR:  2.27:1
Maxgain: 8.95 dBi at 0 Azim
         8.95 dBi at 18.3 Elev
F/R: 4.27 dB dB (F/B: 0 dB ;0 dB at 162 El)
Total Loss: 0.03 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_17.100.ant ---- Oct 18, 2020 07:03:56
Spiral Antenna, Iteration f_lo = 17.1
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 275
 
Freq: 21 MHz
Wire/Structure Loss: 0.78% 
Source  Zr/Zi: 956.1, -j777.8 ohms
 SWR:  2.27:1
Maxgain: 8.95 dBi at 0 Azim
         8.95 dBi at 18.3 Elev
F/R: 4.27 dB dB (F/B: 0 dB ;0 dB at 162 El)
Total Loss: 0.03 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_17.300.ant ---- Oct 18, 2020 07:04:00
Spiral Antenna, Iteration f_lo = 17.3
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 261
 
Freq: 21 MHz
Wire/Structure Loss: 0.85% 
Source  Zr/Zi: 1734.5, -j871.3 ohms
 SWR:  2.54:1
Maxgain: 8.2 dBi at 0 Azim
         8.2 dBi at 18.1 Elev
F/R: 4.1 dB dB (F/B: 0 dB ;0 dB at 162 El)
Total Loss: 0.04 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_17.500.ant ---- Oct 18, 2020 07:04:03
Spiral Antenna, Iteration f_lo = 17.5
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 261
 
Freq: 21 MHz
Wire/Structure Loss: 0.85% 
Source  Zr/Zi: 1734.5, -j871.3 ohms
 SWR:  2.54:1
Maxgain: 8.2 dBi at 0 Azim
         8.2 dBi at 18.1 Elev
F/R: 4.1 dB dB (F/B: 0 dB ;0 dB at 162 El)
Total Loss: 0.04 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_17.700.ant ---- Oct 18, 2020 07:04:05
Spiral Antenna, Iteration f_lo = 17.7
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 261
 
Freq: 21 MHz
Wire/Structure Loss: 0.85% 
Source  Zr/Zi: 1734.5, -j871.3 ohms
 SWR:  2.54:1
Maxgain: 8.2 dBi at 0 Azim
         8.2 dBi at 18.1 Elev
F/R: 4.1 dB dB (F/B: 0 dB ;0 dB at 162 El)
Total Loss: 0.04 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_17.900.ant ---- Oct 18, 2020 07:04:07
Spiral Antenna, Iteration f_lo = 17.9
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 261
 
Freq: 21 MHz
Wire/Structure Loss: 0.85% 
Source  Zr/Zi: 1734.5, -j871.3 ohms
 SWR:  2.54:1
Maxgain: 8.2 dBi at 0 Azim
         8.2 dBi at 18.1 Elev
F/R: 4.1 dB dB (F/B: 0 dB ;0 dB at 162 El)
Total Loss: 0.04 dB (Efficiency: 99.2%)

