Dipole antenna electric field generation
Lets take the example of an AC light bulb being lightened by a 230V
  50Hz source


The wavelength of 50 Hz is 6,000 kilometres so any electron bunching will be miniscule to the point of anyone not being able to detect the effect. If the wire were a km long or the lightbulb were maybe a km high then yes, you will start to see this phenomena.

Antennas rely on the signal wavelength being in the same realm as their dimensions to achieve the optimum interface between an electrical feed circuit (aka coax etc.) and the impedance of free space. Take a look at this: -



Picture is public domain and taken from here.

The signal generator produces a frequency whose wavelength (\$\lambda\$) is twice the length of the antenna (a half wave dipole). This is optimal for a dipole to achieve best conversion of electrical power to electromagnetic radiated power.