[en] This work is devoted to an experimental investigation of the wave propagation characteristics and the rf supplemented confinement enhancement principles of a multiple mirror plasma at the fundamental and second harmonic of the ion cyclotron frequency. Keeping the magnetic field constant, rf power at 5.6 and 11.2 MHz was coupled to a fully ionized plasma with densities of 10¹³ cm^-3. Electrostatically shielded and unshielded single turn circular loop antennas concentric with the plasma column were used to couple rf energy to the plasma such that ω greater than Ω/sub ci/ at the point of excitation. Experiments were also done using multiple antennas - up to a maximum of three single turn loop antennas were excited in parallel and in phase from the same rf generator