Offline Tool
NVIS Band Advisor
Which HF band to try for regional NVIS (300 mi or less)? Starting points — always verify on-air.
NVIS frequency guidance by time of day and season for regional HF emergency communications. Offline advisor. Works offline after your first visit.
Which HF band to try for regional NVIS (300 mi or less)? Starting points — always verify on-air.
Near Vertical Incident Skywave — HF antennas radiating nearly straight up for regional coverage under about 300 miles.
When you need regional HF comms without skip zone gaps — common in emcomm and state nets.
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.
Paid emergency communications consulting for estates, ranches, and remote properties — plus contact and newsletter.