Residents living under rooftop antennas suffer illnesses which improve when antennas are removedShiniyo et al. Significant Decrease of Clinical Symptoms after Mobile Phone Base Station Removal –An Intervention Study 2014This Japanese study showed statistically significant adverse health effects from electromagnetic radiation from mobile phone antennas. 107 out of 122 residents of a building with cell phone  antennas on the rooftop for 11 years were medically examined before and after the antennas were removed. (The residents had no prior knowledge about possible effects.) In several cases, significant effects on the inhabitants’ health could be proven. The health of these inhabitants was shown to improve after the removal of the antennas, and the researchers could identify no other factors that could explain this health improvement.
Those living nearer to mobile base stations show greater DNA damage than those living further away Zothansiama et al Impact of radiofrequency radiation on DNA damage and antioxidants in peripheral blood lymphocytes of humans residing in the vicinity of mobile phone base stations2017 This study evaluates the effect of RFR on DNA damage and antioxidant status in cultured human peripheral blood lymphocytes (HPBLs) of individuals residing in the vicinity of mobile phone base stations. Those residing within 80m of mobile base stations showed a significantly higher incidence of DNA damage when compared to the control group, residing 300 m away from the mobile base station/s. 
Research shows headaches in people living near mobile phone masts at radiation levels well below PHE/ICNIRP safety standards Hutter et al Subjective symptoms, sleeping problems, and cognitive performance in subjects living near mobile phone base stations 2006  A cross-sectional study of 365 randomly selected inhabitants living in urban and rural areas for more than one year near to 10 selected base stations. Total HF-EMF and exposure related to mobiletelecommunication were far below recommended levels. Distance from antennae was 24-600 m in the rural area and 20-250 m in the urban area. Despite the influence of confounding variables, including fear of adverse effects from exposure to the base stations, there was a significant relation of some symptoms, especially for headaches.
Residents living near mobile phone masts report poor concentration, stress and headachesRöösli Symptoms of ill health ascribed to electromagnetic field exposure–a questionnaire survey 2004 This Swiss survey study reported that out of 429 questionnaires returned, 394 people reported symptoms from mobile phone tower exposure. Fifty-eight percent of these symptomatic people suffered headaches, 19% nervous stress, and 18% fatigue, while concentration difficulties were the most common complaint.
Research conducted on people living near masts show increase in headaches, sleep problems, depression, memory loss, irritability, concentration, discomfort, headaches, dizziness, tremors, blurred vision, nausea, lack of appetite, circulatory complaintsSantini et al. Investigation on the health of people living near mobile telephone relay stations: Incidence according to distance and sex  2002     Abdel-Rassoul et al Neurobehavioral effects among inhabitants around mobile phone base stations  2007   Bortkiewicz et al. Subjective symptoms reported by people living in the vicinity of cellular phone base stations: review 2004           People living near mobile phone masts reported more symptoms of headache, sleep disturbance, discomfort, irritability, depression, memory loss and concentration problems the closer they lived to the installation. Study authors recommend that the minimal distance of people from cellular phone base stations should not be < 300 m.  This study found that living nearby mobile phone base stations (cell antennas) increased the risk for neuropsychiatric problems such as headaches, memory problems, dizziness, tremors, depression, sleep problems and some changes in the performance of neurobehavioral functions.    This study (involving a questionnaire survey) confirmed that residents living close to mobile phone masts reported “Various complaints mostly of the circulatory system, but also of sleep disturbances, irritability, depression, blurred vision, concentration difficulties, nausea, lack of appetite, headache and vertigo. The study shows relationships between the incidence of individual symptoms, the level of exposure, and the distance between a residential area and a base station. This association was observed both in persons who linked their complaints with the presence of the base station and those who did not notice such a relation.”   
Increased risk of cancer has been observed near mobile phone mastsEger et al. The Influence of Being Physically Near to a Cell PhoneTransmission Mast on the Incidence of Cancer 2004    Eger H, Neppe F.,  Incidence of cancer adjacent to a mobile telephone basis station in Westfalia 2009    Wolf and Wolf Increased Incidence of Cancer Near a Cell-phone Transmitter Station 2004     Dode et al. Mortality by neoplasia and cellular telephone base stations in the Belo Horizontemunicipality, Minas Gerais state, Brazil 2011  This study, commissioned by the German Federal Agency for Radiation Protection, compiled medical histories between 1994–2004 of people living in Naila, Bavaria. The study found a threefold increase in malignant tumours for people exposed for five years or more to cellphone masts within 400 metres, compared with people living further away. A pilot study was conducted in Hennen, Germany, to investigate the cancer incidence adjacent to a mobile phone base station. The authors concluded that a statistically significant increase of cancer incidence was observed 5 years after the base station had started operating. 
A Tel Aviv University study of 622 people living in Netanya, Israel, revealed an overall fourfold increase in the incidence of cancer among residents living within 350 metres of a cellphone mast for a period of between three and seven years.   This study looked at 7191 deaths by cancer in Brazil’s third-largest city, Belo Horizonte, between 1996 and 2006. The highest rate of deaths from cancer was found among those who had lived within 500 metres of cellphone masts; there was a 35% increase in cancers for those living within 100 metres. There were high rates of prostate, breast, lung, kidney and liver cancer among the victims living closest to masts.
An independent review concludes 8/10 studies show increase in neurological symptoms or cancer within 500m at RFR levels well below PHE/ICNIRP safety levels Khurana et al. Epidemiological evidence for a health risk from mobile phone base stations 2010 This independent review looked at ten epidemiological studies: “We found that eight of the 10 studies reported increased prevalence of adverse neurobehavioral symptoms or cancer in populations living at distances under 500 metres from base stations. None of the studies reported exposure above accepted international guidelines, suggesting that current guidelines may be inadequate in protecting the health of human populations.”
There is enough medical and scientific evidence for liability of telecoms companies to be an issue Pearce, J Limiting liability with positioning to minimize negative health effects of cellular phone towers  2019As use of mobile phones increases, both the density of base stations and their power output is expected to increase the global human RFR exposure. Although direct causation of negative human health effects from RFR from cellular phone base stations has not been finalized, there is already enough medical and scientific evidence to warrant long-term liability concerns for companies deploying cellular phone towers.