% 2024 DL9MJ, Matthias
\begin{circuitikz}
    \draw(0,0) 
        to [american inductor] ++(0,2)
        to [short,-*] ++(1,0) node[antenna, DARCred](){}
        to [short,-*] ++(1,0) coordinate(c2)
        to [variable capacitor,invert, tunable end arrow={Triangle},-*] ++(0,-2) coordinate(c3)
        to [short,-*] ++(-1,0)
        node[ground](gnd){}
        to [short] ++(-1,0);
    \draw[DARCblue](c2)
        to [stroke diode, DARCblue] ++(3,0) coordinate(foo);
    \draw[DARCgreen](foo)
        to [loudspeaker, DARCgreen, l={2,7 k$\Omega$}] ++(0,-2) coordinate(bar);
    \draw(bar)
        to [short] (c3);
\end{circuitikz}