---- Log_Spiral_f_lo_13.500.ant ---- Oct 18, 2020 07:06:04
Spiral Antenna, Iteration f_lo = 13.5
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 505
 
Freq: 28 MHz
Wire/Structure Loss: 1.35% 
Source  Zr/Zi: 903.4, -j932.8 ohms
 SWR:  2.7:1
Maxgain: 3.23 dBi at 226 Azim
         3.23 dBi at 11.2 Elev
F/R: 2.69 dB dB (F/B: 2.32 dB ;2.41 dB at 169 El)
Total Loss: 0.06 dB (Efficiency: 98.6%)

---- Log_Spiral_f_lo_13.700.ant ---- Oct 18, 2020 07:06:08
Spiral Antenna, Iteration f_lo = 13.7
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 479
 
Freq: 28 MHz
Wire/Structure Loss: 1.56% 
Source  Zr/Zi: 2362, +j6.7 ohms
 SWR:  2.62:1
Maxgain: 4.96 dBi at 222 Azim
         4.96 dBi at 13.9 Elev
F/R: 4.54 dB dB (F/B: 1.95 dB ;2.24 dB at 166 El)
Total Loss: 0.07 dB (Efficiency: 98.4%)

---- Log_Spiral_f_lo_13.900.ant ---- Oct 18, 2020 07:06:11
Spiral Antenna, Iteration f_lo = 13.9
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 479
 
Freq: 28 MHz
Wire/Structure Loss: 1.56% 
Source  Zr/Zi: 2362, +j6.7 ohms
 SWR:  2.62:1
Maxgain: 4.96 dBi at 222 Azim
         4.96 dBi at 13.9 Elev
F/R: 4.54 dB dB (F/B: 1.95 dB ;2.24 dB at 166 El)
Total Loss: 0.07 dB (Efficiency: 98.4%)

---- Log_Spiral_f_lo_14.100.ant ---- Oct 18, 2020 07:06:14
Spiral Antenna, Iteration f_lo = 14.1
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 455
 
Freq: 28 MHz
Wire/Structure Loss: 1.36% 
Source  Zr/Zi: 813.5, +j582.1 ohms
 SWR:  1.96:1
Maxgain: 6.45 dBi at 203 Azim
         6.45 dBi at 14.9 Elev
F/R: 4.2 dB dB (F/B: 0.45 dB ;0.55 dB at 165 El)
Total Loss: 0.06 dB (Efficiency: 98.6%)

---- Log_Spiral_f_lo_14.300.ant ---- Oct 18, 2020 07:06:18
Spiral Antenna, Iteration f_lo = 14.3
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 455
 
Freq: 28 MHz
Wire/Structure Loss: 1.36% 
Source  Zr/Zi: 813.5, +j582.1 ohms
 SWR:  1.96:1
Maxgain: 6.45 dBi at 203 Azim
         6.45 dBi at 14.9 Elev
F/R: 4.2 dB dB (F/B: 0.45 dB ;0.55 dB at 165 El)
Total Loss: 0.06 dB (Efficiency: 98.6%)

---- Log_Spiral_f_lo_14.500.ant ---- Oct 18, 2020 07:06:22
Spiral Antenna, Iteration f_lo = 14.5
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 455
 
Freq: 28 MHz
Wire/Structure Loss: 1.36% 
Source  Zr/Zi: 813.5, +j582.1 ohms
 SWR:  1.96:1
Maxgain: 6.45 dBi at 203 Azim
         6.45 dBi at 14.9 Elev
F/R: 4.2 dB dB (F/B: 0.45 dB ;0.55 dB at 165 El)
Total Loss: 0.06 dB (Efficiency: 98.6%)

---- Log_Spiral_f_lo_14.700.ant ---- Oct 18, 2020 07:06:26
Spiral Antenna, Iteration f_lo = 14.7
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 431
 
Freq: 28 MHz
Wire/Structure Loss: 1.13% 
Source  Zr/Zi: 481.6, +j34.8 ohms
 SWR:  1.87:1
Maxgain: 7.04 dBi at 182 Azim
         7.04 dBi at 14.6 Elev
F/R: 3.39 dB dB (F/B: 0.01 dB ;0.01 dB at 165 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_14.900.ant ---- Oct 18, 2020 07:06:30
Spiral Antenna, Iteration f_lo = 14.9
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 431
 
Freq: 28 MHz
Wire/Structure Loss: 1.13% 
Source  Zr/Zi: 481.6, +j34.8 ohms
 SWR:  1.87:1
Maxgain: 7.04 dBi at 182 Azim
         7.04 dBi at 14.6 Elev
F/R: 3.39 dB dB (F/B: 0.01 dB ;0.01 dB at 165 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_15.100.ant ---- Oct 18, 2020 07:06:32
Spiral Antenna, Iteration f_lo = 15.1
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 431
 
Freq: 28 MHz
Wire/Structure Loss: 1.13% 
Source  Zr/Zi: 481.6, +j34.8 ohms
 SWR:  1.87:1
Maxgain: 7.04 dBi at 182 Azim
         7.04 dBi at 14.6 Elev
F/R: 3.39 dB dB (F/B: 0.01 dB ;0.01 dB at 165 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_15.300.ant ---- Oct 18, 2020 07:06:35
Spiral Antenna, Iteration f_lo = 15.3
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 409
 
Freq: 28 MHz
Wire/Structure Loss: 1.12% 
Source  Zr/Zi: 493.3, -j425.4 ohms
 SWR:  2.36:1
Maxgain: 6.01 dBi at 182 Azim
         6.01 dBi at 14 Elev
F/R: 2.89 dB dB (F/B: 0.03 dB ;0.03 dB at 166 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_15.500.ant ---- Oct 18, 2020 07:06:38
Spiral Antenna, Iteration f_lo = 15.5
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 409
 
Freq: 28 MHz
Wire/Structure Loss: 1.12% 
Source  Zr/Zi: 493.3, -j425.4 ohms
 SWR:  2.36:1
Maxgain: 6.01 dBi at 182 Azim
         6.01 dBi at 14 Elev
F/R: 2.89 dB dB (F/B: 0.03 dB ;0.03 dB at 166 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_15.700.ant ---- Oct 18, 2020 07:06:41
Spiral Antenna, Iteration f_lo = 15.7
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 409
 
Freq: 28 MHz
Wire/Structure Loss: 1.12% 
Source  Zr/Zi: 493.3, -j425.4 ohms
 SWR:  2.36:1
Maxgain: 6.01 dBi at 182 Azim
         6.01 dBi at 14 Elev
F/R: 2.89 dB dB (F/B: 0.03 dB ;0.03 dB at 166 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_15.900.ant ---- Oct 18, 2020 07:06:44
Spiral Antenna, Iteration f_lo = 15.9
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 409
 
Freq: 28 MHz
Wire/Structure Loss: 1.12% 
Source  Zr/Zi: 493.3, -j425.4 ohms
 SWR:  2.36:1
Maxgain: 6.01 dBi at 182 Azim
         6.01 dBi at 14 Elev
F/R: 2.89 dB dB (F/B: 0.03 dB ;0.03 dB at 166 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_16.100.ant ---- Oct 18, 2020 07:06:47
Spiral Antenna, Iteration f_lo = 16.1
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 387
 
Freq: 28 MHz
Wire/Structure Loss: 1.29% 
Source  Zr/Zi: 890.6, -j976.5 ohms
 SWR:  2.84:1
Maxgain: 5.2 dBi at 184 Azim
         5.2 dBi at 10.9 Elev
F/R: 2.95 dB dB (F/B: 0.15 dB ;0.15 dB at 169 El)
Total Loss: 0.06 dB (Efficiency: 98.7%)

---- Log_Spiral_f_lo_16.300.ant ---- Oct 18, 2020 07:06:50
Spiral Antenna, Iteration f_lo = 16.3
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 387
 
Freq: 28 MHz
Wire/Structure Loss: 1.29% 
Source  Zr/Zi: 890.6, -j976.5 ohms
 SWR:  2.84:1
Maxgain: 5.2 dBi at 184 Azim
         5.2 dBi at 10.9 Elev
F/R: 2.95 dB dB (F/B: 0.15 dB ;0.15 dB at 169 El)
Total Loss: 0.06 dB (Efficiency: 98.7%)

---- Log_Spiral_f_lo_16.500.ant ---- Oct 18, 2020 07:06:54
Spiral Antenna, Iteration f_lo = 16.5
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 387
 
Freq: 28 MHz
Wire/Structure Loss: 1.29% 
Source  Zr/Zi: 890.6, -j976.5 ohms
 SWR:  2.84:1
Maxgain: 5.2 dBi at 184 Azim
         5.2 dBi at 10.9 Elev
F/R: 2.95 dB dB (F/B: 0.15 dB ;0.15 dB at 169 El)
Total Loss: 0.06 dB (Efficiency: 98.7%)

---- Log_Spiral_f_lo_16.700.ant ---- Oct 18, 2020 07:06:56
Spiral Antenna, Iteration f_lo = 16.7
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 367
 
Freq: 28 MHz
Wire/Structure Loss: 1.37% 
Source  Zr/Zi: 2349.6, -j245.9 ohms
 SWR:  2.64:1
Maxgain: 7.35 dBi at 182 Azim
         7.35 dBi at 12.2 Elev
F/R: 4.2 dB dB (F/B: 0.05 dB ;0.05 dB at 168 El)
Total Loss: 0.06 dB (Efficiency: 98.6%)

---- Log_Spiral_f_lo_16.900.ant ---- Oct 18, 2020 07:06:59
Spiral Antenna, Iteration f_lo = 16.9
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 367
 
Freq: 28 MHz
Wire/Structure Loss: 1.37% 
Source  Zr/Zi: 2349.6, -j245.9 ohms
 SWR:  2.64:1
Maxgain: 7.35 dBi at 182 Azim
         7.35 dBi at 12.2 Elev
F/R: 4.2 dB dB (F/B: 0.05 dB ;0.05 dB at 168 El)
Total Loss: 0.06 dB (Efficiency: 98.6%)

---- Log_Spiral_f_lo_17.100.ant ---- Oct 18, 2020 07:07:03
Spiral Antenna, Iteration f_lo = 17.1
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 367
 
Freq: 28 MHz
Wire/Structure Loss: 1.37% 
Source  Zr/Zi: 2349.6, -j245.9 ohms
 SWR:  2.64:1
Maxgain: 7.35 dBi at 182 Azim
         7.35 dBi at 12.2 Elev
F/R: 4.2 dB dB (F/B: 0.05 dB ;0.05 dB at 168 El)
Total Loss: 0.06 dB (Efficiency: 98.6%)

---- Log_Spiral_f_lo_17.300.ant ---- Oct 18, 2020 07:07:06
Spiral Antenna, Iteration f_lo = 17.3
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 347
 
Freq: 28 MHz
Wire/Structure Loss: 1.14% 
Source  Zr/Zi: 1018.9, +j658.7 ohms
 SWR:  1.98:1
Maxgain: 9.52 dBi at 180 Azim
         9.52 dBi at 13.7 Elev
F/R: 4.86 dB dB (F/B: 0.01 dB ;0.01 dB at 166 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_17.500.ant ---- Oct 18, 2020 07:07:10
Spiral Antenna, Iteration f_lo = 17.5
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 347
 
Freq: 28 MHz
Wire/Structure Loss: 1.14% 
Source  Zr/Zi: 1018.9, +j658.7 ohms
 SWR:  1.98:1
Maxgain: 9.52 dBi at 180 Azim
         9.52 dBi at 13.7 Elev
F/R: 4.86 dB dB (F/B: 0.01 dB ;0.01 dB at 166 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_17.700.ant ---- Oct 18, 2020 07:07:13
Spiral Antenna, Iteration f_lo = 17.7
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 347
 
Freq: 28 MHz
Wire/Structure Loss: 1.14% 
Source  Zr/Zi: 1018.9, +j658.7 ohms
 SWR:  1.98:1
Maxgain: 9.52 dBi at 180 Azim
         9.52 dBi at 13.7 Elev
F/R: 4.86 dB dB (F/B: 0.01 dB ;0.01 dB at 166 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

---- Log_Spiral_f_lo_17.900.ant ---- Oct 18, 2020 07:07:16
Spiral Antenna, Iteration f_lo = 17.9
 Sommerfeld-Norton Ground
Zone 1: Conduct=5 mS; Dielec=13
Nr Segments: 347
 
Freq: 28 MHz
Wire/Structure Loss: 1.14% 
Source  Zr/Zi: 1018.9, +j658.7 ohms
 SWR:  1.98:1
Maxgain: 9.52 dBi at 180 Azim
         9.52 dBi at 13.7 Elev
F/R: 4.86 dB dB (F/B: 0.01 dB ;0.01 dB at 166 El)
Total Loss: 0.05 dB (Efficiency: 98.9%)

