Antennas; radio frequency sensors, comprising portable and fixed spectrum radio frequency analyzers and sensors; software defined radios; wireless audio systems, comprising wireless microphones, wireless microphone receivers, in-ear monitor transmitters not for medical purposes, in-ear monitor receivers not for medical purposes; computer software for radio frequency spectrum analysis; radio frequency signal monitoring computer software; computer software for wireless audio signal demodulation and radio frequency coordination; electronic calculators, namely, intermodulation distortion calculators; electronic calculators, namely, transmission line loss calculators; radio frequency mapping and predictive analytics computer software for radio frequency spectrum data; antenna distribution systems, namely, radio frequency amplifiers, combiners for connecting antennas and receivers and power splitters; radio frequency filters, single and multi-channel filter arrays for radio interference suppression; radio frequency to fiber optic conversion systems comprised of optical transmitter and receiver modules; single and multi-channel radio frequency to fiber optic conversion systems comprised of optical transmitter and receiver modules; coaxial cables; fiber optic cables; radio frequency connectors and adapters; network interface systems comprised of computer interface modules and software for monitoring and control of wireless audio system receivers and transmitters