SKYWAVE

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.

Computed on-device from your coordinates — no network needed. Grayline (sunrise/sunset terminator) gives an enhanced DX window on the lower bands.

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.

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Solar flux (SFI), A & K index, HF band conditions. Updates every ~5 min. Tap to open full page.

Kp ≤ 2 quiet · 3–4 unsettled · ≥ 5 storm (HF degraded, aurora possible). Full chart ↗

All links open in your browser. For offline band advice, see the Tools tab — grayline and band planner work without a connection.