Compared to other sources there are relatively few TV and radio stations. While the size of their physical plant makes their presence obvious and barriers are set both for security and to protect the public, such facilities tend to be relatively high-powered. Exposure risks are most often encountered by technicians and engineers who work at such transmitters and towers but the clustering of multiple stations to save real estate and the environment in populated areas have made cancer clusters apparent and problematic in neighborhoods surrounding such "antenna farms".
Two incidents occurred in the 90s in which "Six men are likely to have been accidentally exposed to high levels of very high frequency (VHF) radiofrequency radiation (100 MHz) while working on transmission masts; four men in one incident and two in another. They experienced symptoms and signs which included headache, parasthesiae, diarrhoea, malaise and lassitude. The condition of four men, two men from each incident likely to have had the highest exposure, has shown no significant improvement. The first incident occurred in 1995 and the second in 1996."
Holliday R., Effects of exposure to very high frequency radiofrequency radiation on six
antenna engineers in two separate incidents. Occupational Med (London). 2000