A little bit ashamed, I report that I last night received a confirmation from Radio Amboró, Santa Cruz de la Sierra, Bolivia via Facebook. During the last 35 years I have been sending tens of confirmation request to this station without success. The original report stems from April 11, 1977 when the station was heard by a few Scandinavian listeners on 4915 in the 60 m.b. On April 11, 1977 the station was surprisingly booming in in the middle of downtown Turku (listen to the audio below). The only DXer I know of, reporting the station in April 1977 and who also received a QSL until now, is Johan Berglund (JBS) in Trollhättan, Sweden. Radio Amboró ended their transmissions on shortwave in the late 70’s but continued transmitting on 1250 AM at least up to 2008-2010 (still listed on that frequency in WRTH 2010, but might be incorrect old data). Nowadays, Radio Amboró is only active on 98.5 FM.
The station’s name probably refers to Amboró National Park is in the western part of the Department of Santa Cruz , at the “Elbow of the Andes”, where the eastern cordillera bends slightly westward from its northly course.