**4.4 Current distribution along the vertical antenna at the lossy ground**

The results obtained with TIA approximation are shown in Fig. 16 for real and imaginary part of the current along the vertical antenna having height *h*=300m, radius *a*=0.05m, and resistivity per unit length *R*'=0.1Ω/m, at the lossy ground of relative dielectric constant ε*r*1=2 and ε*r*1=10, specific conductivity σ1=10-1S/m or 10-5S/m, for frequency *f*=3MHz, the number of antenna segments *N*=30, and the degree of polynomial approximation *nk* =3, for *k*=1,...,30.

Fig. 16. Real and imaginary part of the current along the antenna for *h*=300m and radius *a*=0.05m, for different lossy ground parameters and *f*=3MHz
