\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric}
\input{repeater}
\begin{document}
 \begin{tikzpicture}[every node/.style={scale=.8}]
  \activeuser{u1}{ 0,0}{DM3MAT};
  \activeuser{u2}{ 6,2}{DL1XYZ, TG99};
  \user{u3}{ 6,0}{DL2XYZ, TG99};
  \user{u4}{ 6,-2}{DL3XYZ};
  \path[->] (u1) edge[bend left] node[above, rotate=10]{$433.450 MHz$} node[below, rotate=10]{PC: DL1XYZ} (u2);
  \path[->] (u2) edge[bend left] node[above, rotate=10]{$433.450 MHz$} node[below, rotate=10]{PC: DM3MAT} (u1);
 \end{tikzpicture}
\end{document}
