Explanation
Overview Beamwidth describes the angular width of an antenna's main radiation lobe. It indicates how broadly or narrowly an antenna concentrates RF energy in a particular direction. Half-Power Beamwidth Beamwidth is normally specified as the half-power (-3 dB) beamwidth , which is the angle between the two points where radiated power drops to one-half of its maximum value. Narrow vs. Wide Beamwidth Narrow beamwidth generally indicates higher directivity and gain. Wide beamwidth provides broader coverage with less directivity. Typical Examples Vertical antennas have very wide horizontal beamwidth. Dipoles have moderate beamwidth. Yagi antennas often have relatively narrow beamwidth. Applied to Chameleon Products Most Chameleon HF antennas are designed to provide broad coverage rather than narrow directional beams, making them well suited for portable, emergency, and general-purpose amateur radio operation. Related Articles What Is Directivity? What Is Antenna Gain? What Is Radiation Pattern? Related Products All Chameleon Antennas
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.
