Whatever it does (if the phenomenon is real) I'm sure it can be easily detected. If it is powerful enough to affect the human body, sensitive electronics will have no issue detecting it.
Edit: ah it's pulsed radio waves, so basically a radar (which itself is really a microwave oven without the door). Really easily detectable with as much as a diode. It could also cause weird effects in electronics. Like ccfl bars glowing on their own. They might have found a frequency or pulse form that the human body is exceptionally sensitive to.
I'm just a bit sceptical. We know radar can be dangerous at really high power but I'm sure this is the very first thing they would have checked for when this syndrome first came to light. I'd be surprised if the whole radio spectrum around embassies in sensitive parts of the world isn't monitored as part of standard counter surveillance.
