http://dbpedia.org/resource/Ionosphere +
, http://dbpedia.org/resource/Longwave +
, http://dbpedia.org/resource/Two-way_radio +
, http://dbpedia.org/resource/SOTA_Mapping_Project +
, http://dbpedia.org/resource/Radio +
, http://dbpedia.org/resource/Super_low_frequency +
, http://dbpedia.org/resource/Crystal_radio +
, http://dbpedia.org/resource/Battle_of_R%C3%A9union +
, http://dbpedia.org/resource/AMPRNet +
, http://dbpedia.org/resource/Colossus_computer +
, http://dbpedia.org/resource/Radio_wave +
, http://dbpedia.org/resource/Earth%E2%80%93Moon%E2%80%93Earth_communication +
, http://dbpedia.org/resource/Alexander_Gerst +
, http://dbpedia.org/resource/Very_low_frequency +
, http://dbpedia.org/resource/ARRL_International_Humanitarian_Award +
, http://dbpedia.org/resource/Amateur_television +
, http://dbpedia.org/resource/Marshall_D._Moran +
, http://dbpedia.org/resource/LORAN +
, http://dbpedia.org/resource/Osmo_Antero_Wiio +
, http://dbpedia.org/resource/Spark-gap_transmitter +
, http://dbpedia.org/resource/Kingman_Reef +
, http://dbpedia.org/resource/Radio_propagation +
, http://dbpedia.org/resource/Radio_in_Colombia +
, http://dbpedia.org/resource/Dipole_antenna +
, http://dbpedia.org/resource/CAPE-2 +
, http://dbpedia.org/resource/Yaesu_FT-77_%28S%29 +
, http://dbpedia.org/resource/Teletype_Model_33 +
, http://dbpedia.org/resource/Quad_antenna +
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