Terms of Service

Welcome to HamCalc. By accessing or using our website and antenna design calculators, you agree to be bound by these Terms of Service. Please read them carefully.

If you do not agree to these terms, please do not use HamCalc.

1. Acceptance of Terms

By accessing HamCalc, you agree to comply with and be bound by these Terms of Service, our Privacy Policy, and all applicable laws and regulations. These terms apply to all visitors, users, and others who access or use our service.

2. Description of Service

HamCalc provides:

• Free antenna design calculators for amateur radio operators
• Educational content about antenna theory and design
• Tools for exporting and sharing antenna designs
• Interactive charts and visualizations

All services are provided "as is" and free of charge. We reserve the right to modify, suspend, or discontinue any part of our service at any time without notice.

3. Acceptable Use

You agree to use HamCalc only for lawful purposes and in accordance with these Terms. You agree NOT to:

• Use the service in any way that violates any applicable federal, state, local, or international law or regulation
• Attempt to interfere with or disrupt the service or servers
• Use automated systems (bots, scrapers) to access the service without permission
• Reverse engineer, decompile, or attempt to extract source code
• Remove any copyright, trademark, or other proprietary notices
• Use the service to transmit harmful code, viruses, or malware

4. Amateur Radio License Requirements

Important: HamCalc provides tools for designing transmitting antennas. Operating radio transmitters requires a valid amateur radio license in most countries.

You are solely responsible for:

• Ensuring you have the appropriate amateur radio license before transmitting
• Complying with all FCC regulations (in the United States) or equivalent regulatory requirements in your country
• Operating within your license privileges and authorized frequency bands
• Following power limits and technical standards for your license class

5. Calculation Accuracy and Disclaimers

While we strive for accuracy and use established formulas from recognized sources, HamCalc is provided for educational and informational purposes only. The calculations and results:

• Are theoretical estimates based on idealized conditions
• May not account for all real-world factors affecting antenna performance
• Should be verified with physical measurements and testing
• Are not a substitute for professional engineering analysis
• May contain errors or inaccuracies despite our best efforts

You use HamCalc at your own risk. We make no warranties, express or implied, regarding the accuracy, reliability, or suitability of our calculators for any particular purpose.

Always verify calculations independently and follow safe building and operating practices. When in doubt, consult with experienced antenna designers or professional engineers.

6. RF Safety

High voltages and RF radiation can be dangerous.

You are solely responsible for:

• Understanding and following FCC RF exposure guidelines (MPE limits)
• Maintaining safe distances from antennas during transmission
• Properly insulating high-voltage components (especially tuning capacitors in magnetic loops)
• Following electrical safety practices when building antennas
• Ensuring antennas are properly installed and grounded

Our RF safety calculations are estimates. Always verify with proper measurements and follow conservative safety margins. If you are unsure, consult the ARRL RF Safety page or an expert.

7. Intellectual Property

The HamCalc website, including its design, text, graphics, code, and functionality, is owned by HamCalc and protected by copyright, trademark, and other intellectual property laws.

You may:

• Use our calculators for personal, non-commercial purposes
• Share links to HamCalc with others
• Export and save your own calculation results

You may NOT:

• Reproduce, distribute, or create derivative works without permission
• Frame or embed HamCalc content on other websites without permission
• Use HamCalc branding or trademarks without authorization

8. User-Generated Content

Your calculator inputs and results are processed entirely in your browser and are not transmitted to or stored on our servers. Any designs you create using HamCalc remain your property. If we add community features in the future (such as sharing designs), additional terms will apply.

9. Limitation of Liability

To the fullest extent permitted by law:

HamCalc, its creators, contributors, and affiliates shall not be liable for any direct, indirect, incidental, consequential, special, or punitive damages arising from:

• Your use of or inability to use HamCalc
• Errors or inaccuracies in calculations or content
• Antenna designs based on our calculations
• Personal injury, property damage, or equipment damage
• Violations of FCC regulations or other laws
• Unauthorized access to or alteration of your data

This includes liability for damages caused by errors, omissions, interruptions, deletion of files, defects, viruses, delays in operation, or any failure of performance.

10. Indemnification

You agree to indemnify, defend, and hold harmless HamCalc and its creators from any claims, damages, losses, liabilities, and expenses (including legal fees) arising from your use of the service, violation of these Terms, or violation of any third-party rights.

11. Third-Party Links

HamCalc may contain links to external websites or resources. These links are provided for convenience only. We do not control or endorse third-party content and are not responsible for their accuracy, legality, or content. Your use of third-party websites is at your own risk and subject to their terms and privacy policies.

12. Changes to Terms

We reserve the right to modify these Terms of Service at any time. We will notify users of material changes by posting the updated terms on this page and updating the "Last Updated" date. Your continued use of HamCalc after changes are posted constitutes your acceptance of the revised terms.

13. Termination

We reserve the right to terminate or suspend access to HamCalc immediately, without prior notice or liability, for any reason, including if you breach these Terms of Service. Upon termination, your right to use the service will immediately cease.

14. Governing Law

These Terms shall be governed by and construed in accordance with the laws of the United States, without regard to its conflict of law provisions. Any legal action or proceeding arising under these Terms will be brought exclusively in the courts located in the United States, and you consent to personal jurisdiction in such courts.

15. Severability

If any provision of these Terms is found to be unenforceable or invalid, that provision will be limited or eliminated to the minimum extent necessary, and the remaining provisions will remain in full force and effect.

16. Entire Agreement

These Terms of Service, together with our Privacy Policy, constitute the entire agreement between you and HamCalc regarding the use of our service and supersede all prior agreements and understandings.

17. Contact Information

If you have questions about these Terms of Service, please contact us.

18. Acknowledgment

By using HamCalc, you acknowledge that you have read these Terms of Service, understand them, and agree to be bound by them. You also acknowledge that these Terms constitute a binding legal agreement between you and HamCalc.