An electromagnetic wave radiates outwards from a dipole antenna with E0 as the amplitude of its electric field vector. The electric field E0 which transports significant energy from the source falls off as

I ∝Eo2 ∝1r2⇒E0∝1rA diode antenna radiates the electromagnetic waves outwards. The amplitude of electric fieldE0 which transports significant energy from the source falls intensity inversely as the distance r from the antenna i.e,