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