ShiverLogic
Ham Helper: Antenna Tools
Antenna calculators, coax loss, RF safety and offline callsign lookup for amateur radio.
About
A pocket toolkit for amateur radio operators: wire-length calculators, coax loss with SWR, an RF exposure safety calculator, and offline US callsign lookup from FCC license data. The core tools are free, and Ham Helper Pro is a one-time $4.99 unlock with no subscription.
Free
- All wire-length calculators (dipole, fan dipole, EFHW)
- Coax loss with SWR
- RF exposure safety calculator, always free
- Offline US callsign lookup with name, license class and status
Ham Helper Pro: $4.99 one-time, no subscription
- Live drag-to-shape pattern view, including bent dipoles
- Saved setups and side-by-side compare
- Linked dipole and linked EFHW calculators
- Export: pattern PNG/PDF and leg-length PDF/CSV, with an optional RF safety section in the PDF
- Extra callsign details: city/state, approximate grid square and expiry
Coming soon. Store links will appear here at launch.
Questions or feedback? Email support@shiverlogic.com. See our Privacy Policy and the Ham Helper Privacy Policy.