If I had some R&D spying budgets and no health regulation concerns, I would try to see how I could make remote RMI or tomography work, possibly through walls.

If I had some R&D spying budgets and no health regulation concerns, I would try to see how I could make remote RMI or tomography work, possibly through walls. But I suspect something more mudane: a microwave beam, intended at powering a listening device seems more likely. The weird thing is why the Cuban do not switch it off now that it has been detected.