On-call/emergency service with emergency availability within 2 hours Preventative maintenance and technical services including enhancements, install, moving, troubleshooting, repair, and replace of the System or components of it to include deployable towers. FCC Licensing application and maintenance Tower Service and Maintenance o Biannual preventative maintenance services (spring and fall preferred) for all covered tower sites and associated fixed radio infrastructure to include power supplies, switches, and all other necessary components. o Visual and mechanical inspection of tower structures, which could be accomplished by climbing or drone. o Assessment and basic servicing of grounding, antennas, mounts, transmission lines, cabling, microwave system, and enclosures Grounding and other electrical/rf elements of a radio system