The dipole antenna is made of two poles into which radio frequency current flows. This current and the voltage causes an electromagnetic or radio signal to be radiated. Being more specific, a dipole is usually an antenna that uses a resonant length of conductor. This conductor is cut so it can be connected to the what is sending the signal. For resonance, the length of the conductor is an odd number of half wavelengths long. In most cases a single half-wavelength is used.