I used to get headaches when I worked at a sight for more than a couple of hours with three FM's and a TV. The measurements in the transmitter room were in compliance, but there were marked areas outside where you weren't supposed to stand.
When I was the transmitter supervisor at Fremont Peak in the 1970's, the noise of the blowers and the bad lighting, as well as having to monitor the TV picture, gave me headaches. With the Ch 8 TV transmitter on, the lights stayed on even if the switch and the breaker were turned off. RFR in the building was about 2 volts in certain places. TV stations and FM's, microwave, two-way, paging and data bursts, all on the tower right outside the building, less than 150 feet above.
I tend to think that working at altitude, in dry air, in a noisy site, and so forth and so on, is the real reason for headaches and feeling lousy at most transmitter sites. Drinking plenty of water really helped me.
The recently retired post master at Mt Wilson lived there for 30 some odd years, raised a family up there, and never had a problem. The kids looked normal to me. TV broadcasts contribute about 20% to the RFR at Wilson, FM's contribute about 80%.
RFR is over-rated as a hazard, as far as I am concerned. Your chance of injury is likely about 10,000 times less than getting behind the wheel of a car or truck. High levels burn your skin, so don't over-expose yourself. 45 years of high-level exposure, personally, and all my parts are still attached.