Antennas, SWR and Better Signals
Understand the antenna system, coax, SWR and practical installation choices.
The antenna system
The antenna, mounting arrangement, feed line, connectors and radio form one system. Poor mounting, damaged coax or a bad connector can reduce performance even when the transceiver works correctly.
What SWR tells you
Standing-wave ratio indicates how well the feed system is matched at the measurement point. High readings can indicate a mismatch or fault, but low SWR alone does not prove an antenna radiates efficiently or is installed safely.
Placement matters
For mobile stations, use a mechanically secure mount and route coax away from sharp edges, heat and moving parts. For base stations, follow the maker’s instructions and keep the installation clear of overhead power lines.
Tuning safely
Use an appropriate meter and follow the antenna and radio manuals. Do not tune by transmitting into an unsuitable or disconnected antenna.
Troubleshooting order
Inspect connectors and coax; check the meter and jumper lead; verify the mount and installation; then investigate tuning. Change one thing at a time.
Further reading
Always check current rules for the country and radio service you are using. A community convention or software feature is not proof that a transmission is authorised.
This guide is educational and may need updating as regulations, software and community information change. Check linked primary sources before relying on technical or regulatory details.