This is a law of physics that has nothing to do with the antenna.

800KW as shown on the planning application and 2.5MW as shown on Wiki doesn't compute with an antenna gain of 39.9db

I have known a lot of people who have been exposed to high RF fields over the years, and have never heard of any problems, apart from the sex changes!

Antenna gain is not an issue - 800KW refers to the output power of one face of the antenna and 2.5MW refers to the sum of all three faces. However, there's more to it than that, which is not relevant here - You have a p.m.