The “HRA 9100” HF communication system is the next generation HF radio system for flying platforms. It supports multiple communication methods for voice and data links in air-to-air and air-to-ground applications. The HRA 9100 provides highly reliable and encrypted communication links while flying in non-visible conditions including NVIS (Near Vertical Incidence Skywave) and NoE conditions in high profile landscapes. The HRA 9100 consists of the HTR 9100 SDR transceiver, which includes the radio processor, RF modem and transceiver, and the ATU 9100 antenna matching unit.