Re: [helge] LORAN-C
The studies that I've read indicate that damage from RF radiation (such as this) is limited to tissue heating and is usually temporary. Near a typical radio transmitter, this might mean temporary sterility, and apparently warming of the eyeballs is noticeable early on. More power gets you into nausea / vomiting territory, then temporary blindness.
As to the particular power of this transmitter, you'll need to find somebody who's actually been on one, since the intensity of the radiation depends sensitively on the distance from the transmitting element and how the radiation is distributed.
There is, according to what I've read, no conclusive evidence that RF radiation causes, for instance, cancer.