2.Two wires "electric charges are required to excite the fields but are not needed to sustain them and may exist in their absence.This is in direct analogy with water waves." +++++ +++++ (a)Antenna and electric field lines Antenna +++++ ++++ P ● +++++ (b)Antenna and free-space wave2. Two wires “electric charges are required to excite the fields but are not needed to sustain them and may exist in their absence. This is in direct analogy with water waves