let the CM current circulate. It can be noticed that for $d\gg L,\lambda$ the two lines are equivalent to a single wire which radiates double the power of a single wire alone. The radiated power can be obtained by solving for the single wire in free space, considering the array factor given by the image theory [@Balanis:2005:ATA:1208379]. However, if $L\lesssim\lambda$, the equivalent wire behaves like a long wire antenna, which is a kind of slow wave traveling antenna and whose properties have been thoroughly investigated in the literature [@walter1965traveling]. Similarly to the DM case, such antennas radiate only at the presence of non-uniformities, curvatures and discontinuities. The CM radiated power of a finite length TL is [@Balanis:2005:ATA:1208379 Ch. 10] $$\begin{gathered}
P_{rad}^{CM}=\frac{\eta_{0}}{4\pi}\left(\left|I_{f}^{CM}\right|^{2}+\left|I_{b}^{CM}\right|^{2}\right)\cdot \\ \cdot \left(1.415+\log\left(\frac{kL}{\pi}\right)-C_{i}\left(2kL\right)+\operatorname{sinc}\left(2kL\right)\right)\end{gathered}$$ and the equivalent radiation resistance $R^{CM}$ is $$\begin{gathered}
R^{CM}=\frac{2P_{rad}^{CM}}{\left(\left|I_{f}^{CM}\right|^{2}+\left|I_{b}^{CM}\right|^{2}\right)}=\\
=\frac{\eta_{0}}{2\pi}\left(1.415+\log\left(\frac{kL}{\pi}\right)-C_{i}\left(2kL\right)+\operatorname{sinc}\left(2kL\right)\right).\label{eq:rcm}\end{gathered}$$ In order to understand the magnitudes of the radiation resistances in and , we simulated both the equivalent ohmic $R^{Ohm}$ and radiation resistances $R^{CM}$, $R^{DM}$ of a TL made of copper wires with $a$=0.002 m for different cable lengths and frequencies.

It is evident from the plots in that $R^{CM}$ is some order of magnitude greater than $R^{DM}$, while this last one is also a couple 