Mutual impedance spectrum for a monopolar antenna emission and reception, according to the geometry presented in the figure. The parameters used for this calculation are: from left to right, f_pe/ f_ce = 5, 2, 1, 0.5, 0.2, and from bottom to top, λ_De = 5, 10, 20, 40 cm. The different curves correspond to a different angle between the magnetic field and the emission-reception direction.