---- Log_Spiral_f_lo_13.500.ant ---- Oct 18, 2020 07:01:33
Spiral Antenna, Iteration f_lo = 13.5
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 325
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.97% 
Source  Zr/Zi: 551.6, +j232.1 ohms
 SWR:  1.8:1
Maxgain: 5.05 dBi at 182 Azim
         5.05 dBi at 15.2 Elev
F/R: 3.21 dB dB (F/B: 0.04 dB ;0.04 dB at 165 El)
Total Loss: 0.04 dB (Efficiency: 99%)

---- Log_Spiral_f_lo_13.700.ant ---- Oct 18, 2020 07:01:35
Spiral Antenna, Iteration f_lo = 13.7
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 309
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.87% 
Source  Zr/Zi: 520, -j76.3 ohms
 SWR:  1.75:1
Maxgain: 6.52 dBi at 182 Azim
         6.52 dBi at 18.9 Elev
F/R: 3.71 dB dB (F/B: 0.04 dB ;0.04 dB at 161 El)
Total Loss: 0.04 dB (Efficiency: 99.1%)

---- Log_Spiral_f_lo_13.900.ant ---- Oct 18, 2020 07:01:39
Spiral Antenna, Iteration f_lo = 13.9
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 309
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.87% 
Source  Zr/Zi: 520, -j76.3 ohms
 SWR:  1.75:1
Maxgain: 6.52 dBi at 182 Azim
         6.52 dBi at 18.9 Elev
F/R: 3.71 dB dB (F/B: 0.04 dB ;0.04 dB at 161 El)
Total Loss: 0.04 dB (Efficiency: 99.1%)

---- Log_Spiral_f_lo_14.100.ant ---- Oct 18, 2020 07:01:42
Spiral Antenna, Iteration f_lo = 14.1
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 293
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.82% 
Source  Zr/Zi: 614.9, -j380.4 ohms
 SWR:  1.87:1
Maxgain: 7.82 dBi at 180 Azim
         7.82 dBi at 20.5 Elev
F/R: 4.02 dB dB (F/B: 0.01 dB ;0.01 dB at 159 El)
Total Loss: 0.04 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_14.300.ant ---- Oct 18, 2020 07:01:45
Spiral Antenna, Iteration f_lo = 14.3
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 293
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.82% 
Source  Zr/Zi: 614.9, -j380.4 ohms
 SWR:  1.87:1
Maxgain: 7.82 dBi at 180 Azim
         7.82 dBi at 20.5 Elev
F/R: 4.02 dB dB (F/B: 0.01 dB ;0.01 dB at 159 El)
Total Loss: 0.04 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_14.500.ant ---- Oct 18, 2020 07:01:49
Spiral Antenna, Iteration f_lo = 14.5
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 293
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.82% 
Source  Zr/Zi: 614.9, -j380.4 ohms
 SWR:  1.87:1
Maxgain: 7.82 dBi at 180 Azim
         7.82 dBi at 20.5 Elev
F/R: 4.02 dB dB (F/B: 0.01 dB ;0.01 dB at 159 El)
Total Loss: 0.04 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_14.700.ant ---- Oct 18, 2020 07:01:52
Spiral Antenna, Iteration f_lo = 14.7
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 277
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.82% 
Source  Zr/Zi: 897.4, -j693.7 ohms
 SWR:  2.13:1
Maxgain: 8.51 dBi at 180 Azim
         8.51 dBi at 21 Elev
F/R: 4.15 dB dB (F/B: 0 dB ;0 dB at 159 El)
Total Loss: 0.04 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_14.900.ant ---- Oct 18, 2020 07:01:54
Spiral Antenna, Iteration f_lo = 14.9
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 277
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.82% 
Source  Zr/Zi: 897.4, -j693.7 ohms
 SWR:  2.13:1
Maxgain: 8.51 dBi at 180 Azim
         8.51 dBi at 21 Elev
F/R: 4.15 dB dB (F/B: 0 dB ;0 dB at 159 El)
Total Loss: 0.04 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_15.100.ant ---- Oct 18, 2020 07:01:58
Spiral Antenna, Iteration f_lo = 15.1
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 277
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.82% 
Source  Zr/Zi: 897.4, -j693.7 ohms
 SWR:  2.13:1
Maxgain: 8.51 dBi at 180 Azim
         8.51 dBi at 21 Elev
F/R: 4.15 dB dB (F/B: 0 dB ;0 dB at 159 El)
Total Loss: 0.04 dB (Efficiency: 99.2%)

---- Log_Spiral_f_lo_15.300.ant ---- Oct 18, 2020 07:02:01
Spiral Antenna, Iteration f_lo = 15.3
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 263
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.88% 
Source  Zr/Zi: 1589.2, -j855.9 ohms
 SWR:  2.43:1
Maxgain: 8.62 dBi at 0 Azim
         8.62 dBi at 21.1 Elev
F/R: 4.16 dB dB (F/B: 0 dB ;0 dB at 159 El)
Total Loss: 0.04 dB (Efficiency: 99.1%)

---- Log_Spiral_f_lo_15.500.ant ---- Oct 18, 2020 07:02:03
Spiral Antenna, Iteration f_lo = 15.5
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 263
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.88% 
Source  Zr/Zi: 1589.2, -j855.9 ohms
 SWR:  2.43:1
Maxgain: 8.62 dBi at 0 Azim
         8.62 dBi at 21.1 Elev
F/R: 4.16 dB dB (F/B: 0 dB ;0 dB at 159 El)
Total Loss: 0.04 dB (Efficiency: 99.1%)

---- Log_Spiral_f_lo_15.700.ant ---- Oct 18, 2020 07:02:07
Spiral Antenna, Iteration f_lo = 15.7
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 263
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.88% 
Source  Zr/Zi: 1589.2, -j855.9 ohms
 SWR:  2.43:1
Maxgain: 8.62 dBi at 0 Azim
         8.62 dBi at 21.1 Elev
F/R: 4.16 dB dB (F/B: 0 dB ;0 dB at 159 El)
Total Loss: 0.04 dB (Efficiency: 99.1%)

---- Log_Spiral_f_lo_15.900.ant ---- Oct 18, 2020 07:02:10
Spiral Antenna, Iteration f_lo = 15.9
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 263
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.88% 
Source  Zr/Zi: 1589.2, -j855.9 ohms
 SWR:  2.43:1
Maxgain: 8.62 dBi at 0 Azim
         8.62 dBi at 21.1 Elev
F/R: 4.16 dB dB (F/B: 0 dB ;0 dB at 159 El)
Total Loss: 0.04 dB (Efficiency: 99.1%)

---- Log_Spiral_f_lo_16.100.ant ---- Oct 18, 2020 07:02:13
Spiral Antenna, Iteration f_lo = 16.1
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 249
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.98% 
Source  Zr/Zi: 2463.2, +j69.7 ohms
 SWR:  2.74:1
Maxgain: 8.16 dBi at 0 Azim
         8.16 dBi at 21 Elev
F/R: 4.07 dB dB (F/B: 0 dB ;0 dB at 159 El)
Total Loss: 0.04 dB (Efficiency: 99%)

---- Log_Spiral_f_lo_16.300.ant ---- Oct 18, 2020 07:02:15
Spiral Antenna, Iteration f_lo = 16.3
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 249
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.98% 
Source  Zr/Zi: 2463.2, +j69.7 ohms
 SWR:  2.74:1
Maxgain: 8.16 dBi at 0 Azim
         8.16 dBi at 21 Elev
F/R: 4.07 dB dB (F/B: 0 dB ;0 dB at 159 El)
Total Loss: 0.04 dB (Efficiency: 99%)

---- Log_Spiral_f_lo_16.500.ant ---- Oct 18, 2020 07:02:18
Spiral Antenna, Iteration f_lo = 16.5
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 249
 
Freq: 18.068 MHz
Wire/Structure Loss: 0.98% 
Source  Zr/Zi: 2463.2, +j69.7 ohms
 SWR:  2.74:1
Maxgain: 8.16 dBi at 0 Azim
         8.16 dBi at 21 Elev
F/R: 4.07 dB dB (F/B: 0 dB ;0 dB at 159 El)
Total Loss: 0.04 dB (Efficiency: 99%)

---- Log_Spiral_f_lo_16.700.ant ---- Oct 18, 2020 07:02:21
Spiral Antenna, Iteration f_lo = 16.7
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 235
 
Freq: 18.068 MHz
Wire/Structure Loss: 1.08% 
Source  Zr/Zi: 1612, +j1187.7 ohms
 SWR:  2.99:1
Maxgain: 7.13 dBi at 2 Azim
         7.13 dBi at 20.2 Elev
F/R: 3.83 dB dB (F/B: 0.02 dB ;0.02 dB at 160 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_16.900.ant ---- Oct 18, 2020 07:02:23
Spiral Antenna, Iteration f_lo = 16.9
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 235
 
Freq: 18.068 MHz
Wire/Structure Loss: 1.08% 
Source  Zr/Zi: 1612, +j1187.7 ohms
 SWR:  2.99:1
Maxgain: 7.13 dBi at 2 Azim
         7.13 dBi at 20.2 Elev
F/R: 3.83 dB dB (F/B: 0.02 dB ;0.02 dB at 160 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_17.100.ant ---- Oct 18, 2020 07:02:26
Spiral Antenna, Iteration f_lo = 17.1
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 235
 
Freq: 18.068 MHz
Wire/Structure Loss: 1.08% 
Source  Zr/Zi: 1612, +j1187.7 ohms
 SWR:  2.99:1
Maxgain: 7.13 dBi at 2 Azim
         7.13 dBi at 20.2 Elev
F/R: 3.83 dB dB (F/B: 0.02 dB ;0.02 dB at 160 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_17.300.ant ---- Oct 18, 2020 07:02:30
Spiral Antenna, Iteration f_lo = 17.3
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 223
 
Freq: 18.068 MHz
Wire/Structure Loss: 1.16% 
Source  Zr/Zi: 769.5, +j1000.7 ohms
 SWR:  3.15:1
Maxgain: 5.43 dBi at 0 Azim
         5.43 dBi at 18.4 Elev
F/R: 3.3 dB dB (F/B: 0.01 dB ;0.01 dB at 162 El)
Total Loss: 0.05 dB (Efficiency: 98.8%)

---- Log_Spiral_f_lo_17.500.ant ---- Oct 18, 2020 07:02:33
Spiral Antenna, Iteration f_lo = 17.5
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 223
 
Freq: 18.068 MHz
Wire/Structure Loss: 1.16% 
Source  Zr/Zi: 769.5, +j1000.7 ohms
 SWR:  3.15:1
Maxgain: 5.43 dBi at 0 Azim
         5.43 dBi at 18.4 Elev
F/R: 3.3 dB dB (F/B: 0.01 dB ;0.01 dB at 162 El)
Total Loss: 0.05 dB (Efficiency: 98.8%)

---- Log_Spiral_f_lo_17.700.ant ---- Oct 18, 2020 07:02:36
Spiral Antenna, Iteration f_lo = 17.7
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 223
 
Freq: 18.068 MHz
Wire/Structure Loss: 1.16% 
Source  Zr/Zi: 769.5, +j1000.7 ohms
 SWR:  3.15:1
Maxgain: 5.43 dBi at 0 Azim
         5.43 dBi at 18.4 Elev
F/R: 3.3 dB dB (F/B: 0.01 dB ;0.01 dB at 162 El)
Total Loss: 0.05 dB (Efficiency: 98.8%)

---- Log_Spiral_f_lo_17.900.ant ---- Oct 18, 2020 07:02:39
Spiral Antenna, Iteration f_lo = 17.9
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 223
 
Freq: 18.068 MHz
Wire/Structure Loss: 1.16% 
Source  Zr/Zi: 769.5, +j1000.7 ohms
 SWR:  3.15:1
Maxgain: 5.43 dBi at 0 Azim
         5.43 dBi at 18.4 Elev
F/R: 3.3 dB dB (F/B: 0.01 dB ;0.01 dB at 162 El)
Total Loss: 0.05 dB (Efficiency: 98.8%)

