{"query": "The radio horizon — why towers are tall", "count": 20, "results": [{"id": "card_n_9ab6ee5e792c", "title": "The radio horizon — why towers are tall", "shelf": "science", "surface": "secular", "snippet": "Pure geometry, sealed: from height h the horizon lies at √(2hR) — a 100 m tower\nreaches 35,695 m ≈ 35.7 km: https://narrowhighway.com/s/d6211f4efb2518c6de145decf57f27b131a01c24ce7841853f395b7bc986c323"}, {"id": "card_c_9610a78874eb", "title": "The radio horizon — why towers are tall ↔ FM broadcast (VHF) — three-meter waves, line", "shelf": "connections", "surface": null, "snippet": "Every VHF/FM/TV coverage map is this square root wearing terrain.  — a concord the card itself states; mined + verified."}, {"id": "card_src_word_horizon", "title": "horizon", "shelf": "dictionary", "surface": "secular", "snippet": "horizon: (noun) the line at which the sky and Earth appear to meet — syn: apparent horizon, visible horizon, sensible horizon, skyline · (noun) the range of interest or activity that can be anticipate"}, {"id": "card_src_book_73845", "title": "Vision by radio, radio photographs, radio photograms — C. Francis (Charles Francis) Jenkins", "shelf": "gutenberg", "surface": "secular", "snippet": "Vision by radio, radio photographs, radio photograms, by C. Francis (Charles Francis) Jenkins. Subjects: Phototelegraphy. Read the full text (public domain): https://www.gutenberg.org/ebooks/73845"}, {"id": "card_src_word_apparent_horizon", "title": "apparent horizon", "shelf": "dictionary", "surface": "secular", "snippet": "apparent horizon: (noun) the line at which the sky and Earth appear to meet — syn: horizon, visible horizon, sensible horizon, skyline"}, {"id": "card_src_word_sensible_horizon", "title": "sensible horizon", "shelf": "dictionary", "surface": "secular", "snippet": "sensible horizon: (noun) the line at which the sky and Earth appear to meet — syn: horizon, apparent horizon, visible horizon, skyline"}, {"id": "card_src_word_visible_horizon", "title": "visible horizon", "shelf": "dictionary", "surface": "secular", "snippet": "visible horizon: (noun) the line at which the sky and Earth appear to meet — syn: horizon, apparent horizon, sensible horizon, skyline"}, {"id": "card_src_book_11861", "title": "Radio Boys Cronies; Or, Bill Brown's Radio — Wayne Whipple", "shelf": "gutenberg", "surface": "secular", "snippet": "Radio Boys Cronies; Or, Bill Brown's Radio, by Wayne Whipple. Subjects: Boys -- Juvenile fiction; Radio -- Juvenile fiction; Inventors -- Juvenile fiction; New York (State) -- Juvenile fiction. Read t"}, {"id": "card_src_word_c_horizon", "title": "c-horizon", "shelf": "dictionary", "surface": "secular", "snippet": "c-horizon: (noun) beneath the B-horizon and above the bedrock; consisting of weathered rock — syn: C horizon"}, {"id": "card_src_word_radio_aerial", "title": "radio aerial", "shelf": "dictionary", "surface": "secular", "snippet": "radio aerial: (noun) omnidirectional antenna comprising the part of a radio receiver by means of which radio signals are received — syn: radio antenna"}, {"id": "card_src_word_radio_antenna", "title": "radio antenna", "shelf": "dictionary", "surface": "secular", "snippet": "radio antenna: (noun) omnidirectional antenna comprising the part of a radio receiver by means of which radio signals are received — syn: radio aerial"}, {"id": "card_src_word_b_horizon", "title": "b-horizon", "shelf": "dictionary", "surface": "secular", "snippet": "b-horizon: (noun) immediately below the A-horizon; contains deposits of organic matter leached from surface soils — syn: B horizon"}, {"id": "card_src_word_celestial_horizon", "title": "celestial horizon", "shelf": "dictionary", "surface": "secular", "snippet": "celestial horizon: (noun) the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth — syn: horizon"}, {"id": "card_src_word_artificial_horizon", "title": "artificial horizon", "shelf": "dictionary", "surface": "secular", "snippet": "artificial horizon: (noun) a navigational instrument based on a gyroscope; it artificially provides a simulated horizon for the pilot — syn: gyro horizon, flight indicator"}, {"id": "card_src_word_gyro_horizon", "title": "gyro horizon", "shelf": "dictionary", "surface": "secular", "snippet": "gyro horizon: (noun) a navigational instrument based on a gyroscope; it artificially provides a simulated horizon for the pilot — syn: artificial horizon, flight indicator"}, {"id": "card_src_word_a_horizon", "title": "a-horizon", "shelf": "dictionary", "surface": "secular", "snippet": "a-horizon: (noun) the top layer of a soil profile; usually contains humus — syn: A horizon"}, {"id": "card_src_word_radio_brightness", "title": "radio brightness", "shelf": "dictionary", "surface": "secular", "snippet": "radio brightness: (noun) the strength of a radio wave picked up by a radio telescope"}, {"id": "card_src_word_skyline", "title": "skyline", "shelf": "dictionary", "surface": "secular", "snippet": "skyline: (noun) the outline of objects seen against the sky · (noun) the line at which the sky and Earth appear to meet — syn: horizon, apparent horizon, visible horizon, sensible horizon"}, {"id": "card_src_word_radio_reflector", "title": "radio reflector", "shelf": "dictionary", "surface": "secular", "snippet": "radio reflector: (noun) astronomical telescope that picks up electromagnetic radiations in the radio-frequency range from extraterrestrial sources — syn: radio telescope"}, {"id": "card_src_word_radio_telescope", "title": "radio telescope", "shelf": "dictionary", "surface": "secular", "snippet": "radio telescope: (noun) astronomical telescope that picks up electromagnetic radiations in the radio-frequency range from extraterrestrial sources — syn: radio reflector"}]}