I think that's essentially what they did. I got to go into the transmitter room and see the 1' diameter copper pipe which I was told carried the radiation out and up to the tower, and which not to approach too closely.
That would be a circular waveguide. Very common for radar setups.
This whole story sounds horrifically dangerous and unlikely to be approved of with regards to zoning and building inspectors.
By that, I mean I'm a tad bit green with envy.
My thoughts exactly. If I ever write a hard sci-fi novel I want to adapt this setting somehow.