\documentclass{scrartcl}
\usepackage{color}
\usepackage{multicol}
\usepackage[final]{graphicx}
\usepackage{pst-plot,pstricks}
	\input{pstplot-logarithmic-axes}
\begin{document}
	\psset{xunit=3cm,yunit=0.1cm}
	\begin{pspicture}(-2.5,-35)(2.5,10)
		\psgrid[xunit=0.5,yunit=10,subgriddiv=0,griddots=5,gridlabels=0](-4,-3)(4,0)
		\psaxes[log=x,Dy=10]{->}(-2,0)(-2,-30)(2.2,5)
		\psplot[plotstyle=curve,linecolor=green]{-1.5}{0.25}{20 x mul}
		\rput(2,3){$\Omega=\frac{\omega}{\omega_0}$}
		\rput(-2.2,4){$\frac{\left|\underline{H}\left(j\omega\right)\right|}{dB}$}
	\end{pspicture}
\end{document}
