J-Pole antenna

Core J-Pole dimensions

Applies the classic 3/4 λ radiator and 1/4 λ matching section ratios, adjusted by the conductor velocity factor, to deliver the four key measurements A–D.

Ham Calculator

Three practical tools for day-to-day RF work: attenuator pads, balun design, and LC resonance.

VHF | HF

LLM-friendly Docs |

© 2026 Ham Calculator