HFPack: pedestrian antennas

Automatic Link Establishment (ALE) is a digital signaling protocol enabling HF radio stations to automatically establish communication links, crucial for emergency and disaster relief operations. HFLINK serves as a central international resource for ALE High Frequency Communications, HF Selective Calling (SELCALL), and general HF interoperability. The platform provides extensive information on ALE operation, including frequency networks, band plans, and software like PCALE for amateur radio integration. It also documents significant events such as the HF Interoperability Exercise (HFIE) and the Global Simulated Emergency Test (GlobalSET), which allow ham operators to gain real-world experience in interoperable HF communications, often using specific frequencies like the USA 5 MHz ALE simplex frequency 5371.5 kHz USB. The site features articles on antenna types popular among ALE users, such as autotuners and broadband antennas like the T2FD and the Broadband Butterfly Terminated Dipole (BBTD).