If there where such technology....the generator would be located on the west coast of Africa...
Anyone with the time to debunk...might start looking there...
Are there any facilities capable of sustaining large amounts of equipment in that area?
Are there published papers on this tech?
Etc...etc...
Far fetched for sure...but if you wanted a steath weapon against the US economy...a targeted super storm would be it...
Such a generator would not need to be in west Africa as much as it would need to be able to focus on western Africa and have the capacity to track. There are a variety of possibilities with that.
Try that in the plural and then you would be on to something. The purpose of any weapon used against the United States would be to bring our country to its knees.