9 Antennas; RF (radio frequency) communication systems, RF surveillance systems comprising antennas, RF receivers, antenna filters, electronic signal feeds, electronic communication subsystems for use with antennas; and antenna, antenna system, and RF communication system components and accessories, namely, fiber optic cables and connectors for RF and digital transmission; antenna filters; ortho-mode transducers, namely, electro-acoustic transducers and electro-optic transducers; Computer software for use in tracking and monitoring the performance and usage of systems and applications, monitoring networks and infrastructure, remotely monitoring radio frequency (RF) sensors, reviewing monitoring history, identifying anomalies or trends in data, and creating alerts and notifications; software-defined antennas (SDAs); software-defined sensors; software-defined radio frequency systems; computer hardware, namely, switches, chips, processors, and memory; sensors, namely, radio frequency (RF) sensors, radio frequency (RF) sensor arrays