Sean, Tom and Listers:

If I recall from my old theory days, the exposure to an RF field varies with
the inverse square of the distance.  Thus, the closer you are to the radiation
source, the more problemmatic this can become.  Of course, as we know from the
RF exposure calculations, that frequency also plays a role.

At Field Day last year, the guy who helped us erect antennas had a pacemaker.
He asked that we not transmit on HF while he was going to be walking under the
antenna.  Of course, at that point, he would have been no more than 35 feet
from the maximum radiated power.

It wasn't a problem for him as an operator, as he was a bit further from the
antenna and the RV provided additional RF shielding.

I think with a broadcast station, you are not going to be that close to the
antenna; and the 25KWW FM station Sean referenced probably specifies its power
as Effective Radiated Power, which takes antenna gain and pattern compression
into account.

Steve, K8SP