Wire Antennas
9M2PJU Antenna Calculator
Amateur radio antenna, matching, feedline and stub toolkit
Practical dimensions
Start slightly long, install in final position, then trim while measuring SWR or resonance.
Offline ready
The calculator can install as a PWA and keep working without internet after first load.
Shared assumptions
Element VF, coax VF, and impedance fields are reused across antenna and matching tools.