Aspects of the subject disclosure may include, coupler having an array of dielectric antennas positioned around an outer surface of a transmission medium. A processing system can perform operations including selecting at least two dielectric antennas of the array of dielectric antennas, and configuring at least two transmitters coupled to the at least two dielectric antennas according to a wave mode type to generate, via the at least two dielectric antennas, first wireless signals and second wireless signals that combine to induce propagation of electromagnetic waves along a transmission medium according to the wave mode type without requiring an electrical return path. Other embodiments are disclosed.