FEKO_Zin_dipole

Hi everybody!
I have some questions:
a simulation of a dipole with parameters:

Resonance frequency f=1.325 [GHz ]
Total lenght l= 100 mm
Diameter d=1 mm

Parameters of mesh:
Segment lenght sl = 4 mm (100/25)
Wire segment radius r = 0.5 mm

The result is: Zin=57.6-j49
Can I gain resault closer to (approximately) Zin=73+j0 ?
So it is different than expected. I do not know maybe the mesh is a problem?