% Author: Malte Schmitz, DE7LMS
% Year: 2021
\begin{tikzpicture}
  \filldraw[ultra thick, fill=black!25]
    (0,0) -- (1.8,0) -- (1.8,1.1) [rounded corners=\getDarcImageFactor*4mm] -- (4.7,1.1) -- (5.5,0) -- (7,0)
          -- (5.5,0) -- (4.7,-1.1) [sharp corners] -- (1.8,-1.1) -- (1.8,0) -- cycle;
\end{tikzpicture}