Heard a signal and want to know who it is? Type the dial frequency — matches within tolerance, on-air first.
Tap ★ on any listing to keep it here. Favorites that are on the air right now are highlighted.
◆ Add your own frequency
◆ Antenna calculator
Enter a frequency to compute lengths.
Doublet (ladder-line, multiband): cut as long as the lot allows — 135 ft covers 80–10 m, 88 ft for 40–10 m, 44 ft for 40 m up. Feed with window line into a 4:1 Guanella + tuner. Coax-fed resonant dipole:1:1 current balun at the feedpoint. Off-center-fed / folded → 4:1. RG-8X/LMR feedline velocity factor ≈ 0.82–0.86 if you're cutting a phasing/matching section.
◆ Grayline & band planner
Computed on-device from your coordinates — no network needed. Grayline (sunrise/sunset terminator) gives an enhanced DX window on the lower bands.
◆ Export & print
Copy the current On-Air list as plain text (good for a net log or report), save an offline band card, or print a clean reference sheet for the go-kit.
◆ Display
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◆ Full EiBi schedule
Manual load (when auto-update can't reach the server)