I can point to two examples from both ends of the spectrum (no pun intended).
In the UK a group of junior school kids (so under 12s) set up an experiment in which they grew plants right next to the classroom's Wifi and grew a control group about 20 feet from the same Wifi and there was a startling difference in how well those plants grew.
At the other end the Soviet military built the truly massive ZEVS ELF* (extremely low frequency - 82Hz) transmitter which was two 55km long antennae with the ground itself acting as part of the giant ring (in fact a rectangle) antenna. It turned out that to their surprise, trees in between those two antennae grew faster being both taller and with larger trunks.
I believe there are images on-line of the rings of trees which corrolate with when the system was operating.
I'm almost sure that the equivelent US system also demonstrated this same unusual effect so we can put aside most confounding factors especially because the rock that conducts the energy is deep underground below the roots of the trees.
I think there is suffcient evidence to show that electromagnatic energy can affect living things but the inverse-square law seems to apply i.e. either something has to be pumping out an absolutely massive amount of electromagnatic energy and/or that living thing must be in close proximity to the source.
I mean, in the middle various nations have built LLL (less than lethal) weapons where directed millimeter-wave electromagnetic radiation is used to produce extremely nasty but not dangerous (at least not in an acute manner) subjective effects so it isn't as if this isn't known. But again, to have any significant effects the source has to be extremely powerful and even then tighly controlling the beam is the only way for it to have any range. I think those systems have a range of about 1km but that's a tightly focussed beam.
The only thing I've always wondered about is that every electronic appliance needs to convert that 230v/50hz into whatever voltage and frequency that applience uses (DC having a frequency of 0). The things is many of them produce at least a bit of ozone and potentially could form nitrogen oxides and other nasties).
Ozone has a density of about 1.65 times that of air so I imagine if your kit is somewhere that ozone could accumulate, that could produce chronic symptoms. Ozone sensitivity is a genetic trait and I believe researchers have even located the variation responsible for that sensitivity.
It's still unclear if the Cuban and Russian governments were using directed electromagnatic radation to harm US embassey staff and I suspect that we might never know the whole truth on that one.
*Salt water is a terrible medium for the propagation of electromagnatic radiation and it turns out that the lower the frequency, the further the signal can travel thought that salt water so the system was for communication with submarines.
