{"query": "Shortwave (HF) — around the world on the ionosphere's mirror", "count": 1, "results": [{"id": "card_n_a735e61f7ca1", "title": "Shortwave (HF) — around the world on the ionosphere's mirror", "shelf": "science", "surface": "secular", "snippet": "3–30 MHz; the 19 m band's wavelength seals at 15 MHz: https://narrowhighway.com/s/d6211f4efb2518c6de145decf57f27b131a01c24ce7841853f395b7bc986c323 . Here the ionosphere's\nF-layer refracts waves back t", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}], "house": {"door": "FIND", "kind": "cards", "trail": "results", "seal": null, "next_step": {"do": "open the top card", "door": "FIND", "tool": "card_get", "params": {"id": "card_n_a735e61f7ca1"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}