A machine, the machine comprising: a system, wherein the system comprises: a network of a plurality of sensing devices (68A, 68B) distributed throughout the machine, each of the sensing devices located within at least one sub-system component (70, 74) of the machine and operable to communicate through a plurality of electromagnetic signals, wherein each of the sensing devices (68A, 68B) is optionally operable as a control and/or identification device; a shielding (84, 76) surrounding at least one of the plurality of sensing devices (68A, 68B), the shielding configured to contain the electromagnetic signals in a shielded volume proximate to the at least one sub-system component; a remote processing unit operable to communicate with the network of the sensing devices (68A, 68B) through the electromagnetic signals; and a waveguide (72, 250) comprising a waveguide transmitter interface, a waveguide medium, and a waveguide transition interface, wherein the waveguide comprises a first portion between the waveguide transmitter interface and the waveguide transition interface; characterised in that: the waveguide (72, 250) comprises a secondary waveguide transition interface, wherein the waveguide is operable to route a portion of the electromagnetic signal through the waveguide transmitter interface, the waveguide medium, the waveguide transition interface, and the secondary waveguide transition interface to at least one of the sensing devices (68A, 68B), and the waveguide comprises a second portion between the waveguide transition interface and the secondary waveguide transition interface, and the waveguide transition interface comprises a dielectric or thin metal electromagnetic transition window configured to pass a frequency range of interest within the waveguide between the first portion and the second portion of the waveguide (72, 250). a system, wherein the system comprises: a network of a plurality of sensing devices (68A, 68B) distributed throughout the machine, each of the sensing devices located within at least one sub-system component (70, 74) of the machine and operable to communicate through a plurality of electromagnetic signals, wherein each of the sensing devices (68A, 68B) is optionally operable as a control and/or identification device; a shielding (84, 76) surrounding at least one of the plurality of sensing devices (68A, 68B), the shielding configured to contain the electromagnetic signals in a shielded volume proximate to the at least one sub-system component; a remote processing unit operable to communicate with the network of the sensing devices (68A, 68B) through the electromagnetic signals; and a waveguide (72, 250) comprising a waveguide transmitter interface, a waveguide medium, and a waveguide transition interface, wherein the waveguide comprises a first portion between the waveguide transmitter interface and the waveguide transition interface; a network of a plurality of sensing devices (68A, 68B) distributed throughout the machine, each of the sensing devices located within at least one sub-system component (70, 74) of the machine and operable to communicate through a plurality of electromagnetic signals, wherein each of the sensing devices (68A, 68B) is optionally operable as a control and/or identification device; a shielding (84, 76) surrounding at least one of the plurality of sensing devices (68A, 68B), the shielding configured to contain the electromagnetic signals in a shielded volume proximate to the at least one sub-system component; a remote processing unit operable to communicate with the network of the sensing devices (68A, 68B) through the electromagnetic signals; and a waveguide (72, 250) comprising a waveguide transmitter interface, a waveguide medium, and a waveguide transition interface, wherein the waveguide comprises a first portion between the waveguide transmitter interface and the waveguide transition interface; characterised in that: the waveguide (72, 250) comprises a secondary waveguide transition interface, wherein the waveguide is operable to route a portion of the electromagnetic signal through the waveguide transmitter interface, the waveguide medium, the waveguide transition interface, and the secondary waveguide transition interface to at least one of the sensing devices (68A, 68B), and the waveguide comprises a second portion between the waveguide transition interface and the secondary waveguide transition interface, and the waveguide transition interface comprises a dielectric or thin metal electromagnetic transition window configured to pass a frequency range of interest within the waveguide between the first portion and the second portion of the waveguide (72, 250). the waveguide (72, 250) comprises a secondary waveguide transition interface, wherein the waveguide is operable to route a portion of the electromagnetic signal through the waveguide transmitter interface, the waveguide medium, the waveguide transition interface, and the secondary waveguide transition interface to at least one of the sensing devices (68A, 68B), and the waveguide comprises a second portion between the waveguide transition interface and the secondary waveguide transition interface, and the waveguide transition interface comprises a dielectric or thin metal electromagnetic transition window configured to pass a frequency range of interest within the waveguide between the first portion and the second portion of the waveguide (72, 250).