And if you have a pacemaker get some lead T-shirts.
Seriously, in my days as a Plant Craftsman I handled some serious power equipment, ac driven motor generator sets of the 500 DC amp variety, How great an area would you need to beam this low level microwave over to get enough power for, oh let's say, Washington DC? Look at some of the solar power plants (there is one in Spain) and the area they cover in acres. Or maybe they are thinking of everyone having a dish on the roof just above the lead shingles.
Sure some of those Popular Mechanics future visions have come true - Hammacher Schlemaker will sell you a flying car for $300,000. I may still have the catalog.