[anobjectivist]

I dunno about microwaves, but this has already been done here in the US with lasers instead of microwaves. Same principle, energy fired at a light and mirror-reflective dish, except ours went somewhere around 100 feet up. It had to be stabilized by rotation (they would get it spinning with compressed air right before take off).

I believe the discovery channel had a program on them.

[Semper911]

dunno about microwaves, but this has already been done here in the US with lasers instead of microwaves.

Before there were lasers (Light Amplification by Stimulated Emission of Radiation), there were masers (Microwave Amplification by Stimulated Emission of Radiation).

I don't know, but I suspect this is technically a maser beam, and is absent a light component.