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Chameleon Knowledge Base · The Complete Online HF Antenna Handbook

What Is SHARES?

Learn what SHARES is and how it provides interoperable HF communications for government emergency preparedness.

Getting Started HF Fundamentals Reviewed 2026-07-14
Short Answer: Learn what SHARES is and how it provides interoperable HF communications for government emergency preparedness.

Explanation

Overview SHARES (SHAred RESources High Frequency Radio Program) is a U.S. government interoperability program that uses HF radio to support emergency communications among federal, state, tribal, territorial, and certain critical infrastructure organizations. The program is administered by the Cybersecurity and Infrastructure Security Agency (CISA). Purpose Continuity of government. Disaster communications. Interagency interoperability. Infrastructure resilience. Capabilities HF voice. Digital messaging. Email over HF. Nationwide communications. Participation Participation is limited to eligible organizations and agencies operating under SHARES program guidelines. Applied to Chameleon Products HF antenna systems with rapid deployment capability, such as many Chameleon products, are well suited for organizations requiring dependable field communications and interoperability. Related Articles What Is MARS? What Is EMCOMM? What Is ALE? What Is Winlink? Related Products CHA EMCOMM III CHA MPAS 2.0

The exact result depends on the complete station: frequency, geometry, feed line, matching network, return-current path, environment, operating power, and the reference plane of any measurement. A low SWR establishes an impedance relationship at that point; it does not by itself prove efficiency, radiation pattern, compatibility, or safety.

What to Verify

  • Use the newest official product guide or primary service documentation.
  • Confirm the exact model, revision, components, configuration, and operating conditions.
  • Begin tests at low power and change one variable at a time.
  • Do not infer compatibility from connector or thread fit.

Learn Next

  • Antenna Selection: A Mission-First Decision Guide
  • Engineering Design Tradeoffs in Portable HF Antennas
  • Antenna Measurement Reference Planes
  • Understanding Common-Mode Current

Source note: Independently synthesized with reference to The ARRL Handbook for Radio Communications, 99th edition (2022), and The ARRL Antenna Book for Radio Communications, 24th edition (2019). Verify changing regulations, services, software, specifications, availability, and safety requirements against current primary sources.