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Strangely enough I read that just the other week - we went to a museum that used to be a prisoner of war camp, and one of the exhibits was about the competition the government ran to try and create a 'death ray', and they discovered radar by accident.
I was VERY impressed with the place, we could have done longer there, I initially thought a couple of hours would be more than enough, but we only left when it got too dark.
it has been done and varies well enough for ATV which is reasonably wideband ...
I do have the paperwork for a project presented in 73 Amateur Radio mag of some years back, that an amateur radio op used for doing ATV on 2.4GHz using around 500W microwave magnetron