Removed the bug in simulation.
Here are results.
Please note that these simulations are for antenna in free space. When I find time, I will simulate for antenna at 6 meters (20 feet) above real ground, and post results.
(1) Spider 1/4 wavelength Whip
Geometry: Whip = 68 mm, Radials = 8 x 68 mm, slanting 45 deg, Built on connector SO239
Gain = 1.31 dBi
Impedance = 66.1 + j 24.7
SWR 50 = 1.66
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(2) Spider 1/2 wavelength Whip
Geometry: Whip = 138 mm, Radials = 8 x 68 mm, slanting 45 deg, Built on connector SO239
Gain = 0 dBi
Impedance = 511 - j 722
SWR 50 = 30.7
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(1) Horizontal Ground-plane 1/2 wavelength Whip
Geometry: Whip = 138 mm, Radials = 8 x 68 mm, Horizontal, Built on connector SO239
Gain = 3.5 dBi
Impedance = 833 - j 658
SWR 50 = 27.1
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SIMULATION 1 OF 3: Spider, 1/4 wavelength Whip
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SIMULATION 2 OF 3: Spider, 1/2 wavelength Whip
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SIMULATION 3 OF 3: Horizontal Ground-plane, 1/2 wavelength Whip
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