Offline Tool
Antenna Length Calculator
Quick wire-antenna math for field builds. Trim long, tune with an analyzer or SWR meter.
Calculate dipole, quarter-wave, and ⅝-wave antenna dimensions from frequency. Velocity factor adjustable. Works offline. Works offline after your first visit.
Quick wire-antenna math for field builds. Trim long, tune with an analyzer or SWR meter.
468 divided by frequency in MHz gives approximate total length in feet for a half-wave dipole.
Typically 1/10 to 1/4 wavelength high — not a DX skywave antenna.
KI4TQN is a ham radio, GMRS, and emergency communications hub from East Tennessee — free tools, local reference data, YouTube-aligned guides, and consulting for property owners. Use this map to find your lane.
Pick a path: FCC-licensed GMRS, ham exam study, FRS, Meshtastic, just licensed, emcomm volunteer, or property owner.
113 offline browser tools plus step-by-step deployment workflows. Install the site as a PWA for field use.
Tri-Cities, Erwin / Unicoi (I-26), NETNRC linked repeaters, nets, HF listening, go-bag sheets, and ARES/RACES context.
Blog, videos, downloads, antenna reference, and curated radio links — tied to the YouTube channel.
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