Phase plus Antiphase radio waves

[Nickelodeon]

If you produced a focused beam from, say, a cassegrain transmitter which consisted of two waves merged but one inverted what would be the result. I presume there would be destructive interference.
My question is, where does the energy go?

 

[DrClaude]

The energy goes to the regions where the interference is constructive. In other words, you can't get a purely destructive interference everywhere.