What this tool is for
Calculate helical antenna circumference, pitch and axial-mode dimensions.
Basic formula
Axial-mode helix uses circumference near one wavelength.
Design notes
Use these values as a starting point. Real RF performance depends on PCB layout, ground plane, enclosure, cable loss, connectors and measurement conditions.
Common mistakes
Common mistakes include ignoring coax loss, poor antenna placement, missing ground plane, wrong impedance and testing too close to objects.