\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric}
\input{repeater}
\begin{document}
 \begin{tikzpicture}[every node/.style={scale=.8}]
  \user{U1}{0,0}{DM3MAT};
  \activeuser{U2}{6,0}{DL2XYZ};
  \path[->] (U2) edge node[above] {$144.500 MHz$} (U1) ;
 \end{tikzpicture}
\end{document}
