A device comprising: a transmitter coupled to transmit signals to one or more signal-carrying media having waveguide properties and supporting a plurality of waveguide modes; and at least one coupler coupled between the transmitter and the signal-carrying media, the at least one coupler couples the signals to the signal-carrying media via at least one waveguide mode within the plurality of waveguide modes; and wherein the signal-carrying media comprises at least one wire, each wire comprising a conductor covered with a dielectric insulator and the first signal propagates at least partially around the at least one wire; characterized in that the transmitter has a plurality of antennas (13.1.1-13.2L.p) that shapes and concurrently transmits a first signal into the transmission media; wherein the device further comprises a calibration unit coupled within the transmitter, the calibration unit transmits a plurality of test signals onto the signal-carrying media to select a first configuration of the plurality of antennas that results in a preferred shape of the first signal; wherein, the transmitter comprises a vector precoder and one or more of the following is satisfied: a. the calibration unit adjusts settings across the vector precoder, the adjustable settings cause a shape of the plurality of test signals to change based on vector weights generated within the precoder and applied to at least one antenna within the plurality of antennas; b. the vector precoder reduces an interference caused by another transmitter or coupled from a different transmission mode which is not intended to be received by a corresponding receiver; and c. the vector precoder is a type selected from a group consisting of: linear, zero-forcing, minimum mean squared error, MMSE, non-linear, generalized decision feedback equalizer, GDFE. a transmitter coupled to transmit signals to one or more signal-carrying media having waveguide properties and supporting a plurality of waveguide modes; and at least one coupler coupled between the transmitter and the signal-carrying media, the at least one coupler couples the signals to the signal-carrying media via at least one waveguide mode within the plurality of waveguide modes; and wherein the signal-carrying media comprises at least one wire, each wire comprising a conductor covered with a dielectric insulator and the first signal propagates at least partially around the at least one wire; characterized in that the transmitter has a plurality of antennas (13.1.1-13.2L.p) that shapes and concurrently transmits a first signal into the transmission media; wherein the device further comprises a calibration unit coupled within the transmitter, the calibration unit transmits a plurality of test signals onto the signal-carrying media to select a first configuration of the plurality of antennas that results in a preferred shape of the first signal; wherein, the transmitter comprises a vector precoder and one or more of the following is satisfied: a. the calibration unit adjusts settings across the vector precoder, the adjustable settings cause a shape of the plurality of test signals to change based on vector weights generated within the precoder and applied to at least one antenna within the plurality of antennas; b. the vector precoder reduces an interference caused by another transmitter or coupled from a different transmission mode which is not intended to be received by a corresponding receiver; and c. the vector precoder is a type selected from a group consisting of: linear, zero-forcing, minimum mean squared error, MMSE, non-linear, generalized decision feedback equalizer, GDFE. a. the calibration unit adjusts settings across the vector precoder, the adjustable settings cause a shape of the plurality of test signals to change based on vector weights generated within the precoder and applied to at least one antenna within the plurality of antennas; b. the vector precoder reduces an interference caused by another transmitter or coupled from a different transmission mode which is not intended to be received by a corresponding receiver; and c. the vector precoder is a type selected from a group consisting of: linear, zero-forcing, minimum mean squared error, MMSE, non-linear, generalized decision feedback equalizer, GDFE.