Hello,
Thats the problem, nothing visible, but by the time you feel the heat, its too late.
There were some large trees at the end of the Radar bays in camp, we could bring the leaves off them in the summer, they are probably all dead now !!.
But nobody warned us, or told us how dangerous the radiation could be, only warning notice was on top of the Van, saying that the dish could move without warning, nothing else.
John. :)