\documentclass{scrartcl}
\usepackage{color}
\usepackage{multicol}
\usepackage[final]{graphicx}
\usepackage{pst-plot,pstricks}
	\input{pstplot-logarithmic-axes}
\begin{document}
	\psset{xunit=2cm,yunit=2cm}
	\begin{pspicture}(-1.5,-0.7)(1.5,0.7)
		\psaxes[Dx=2,Dy=0.5]{->}(0,0)(-1.5,-0.7)(1.5,0.7)
		\psplot[plotstyle=curve,linecolor=green]{-1.5}{0}{-0.5}
		\psplot[plotstyle=curve,linecolor=green]{0}{1.5}{0.5}
		\rput[l](1.6,0){$\omega$}
		\rput[r](-0.2,1){$\frac{\Theta\left(\underline{H}\left(j\omega\right)\right)}{\pi}$}
	\end{pspicture}
\end{document}
