So most of the time, you would be exposed to very little of that power. That's why people spend big bucks for the big antennae, to get the power sent where it is needed.
Just don't spend too much time in the direct line between them and whatever they are aimed at.
You could usually tell when you got in the beam - your variometer would totally fritz for about half a second. No other (visible) effect though....
I actually suspect that the real power was aimed to the east, and the feeder beam was what we always intercepted as we flew on the west side. Maybe.