To test the hypothesis that body-resonant radiation may explain the correlation between body height and cancer risk observed in most countries around the world.Data on cancer incidence and body height were collected from different countries and also from different regions within Sweden. Information on local FM broadcasting transmitters was also collected in Sweden to determine whether they correlated with the cancer incidence and body heights reported in each geographical area. Because broadcasting radiation may be concentrated by metal spring mattresses, we also attempted to collect information on the use of these mattresses in different parts of the world.A strong association was found between melanoma incidence and body height, both in different countries and in different municipalities within Sweden. At the same time, a very strong association was found between cancer incidence, mean body height, and the effective number of FM transmitters covering a given locality. Available data on the use of metal spring mattresses in different parts of the world also correlated well with data on cancer rates and body heights.The hypothesis that body-resonant radiation may affect both cancer incidence and body height was supported by the strong associations found in this study. The hypothesis was further supported by the correlation found between the incidence of cancer, body height, and the use of metal spring mattresses.