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# An EM wave radiation outwards from a dipole antenna with $E_0$ as the amplitude of its electric field vector . The electric field $E_0$ which transports significant energy from the source falls off as

$\begin{array}{1 1} \large\frac{1}{r^3} \\\large\frac{1}{r^2} \\ \large\frac{1}{8} \\ remains\;constant \end{array}$

From a diode antenna , the $e_m$ waves are radiated outwards .
The amplitude of the electric field vector $(E_0)$ transports significant energy from the source .
Hence $E_0 \alpha \large\frac{1}{r}$