The control box shows up on Ebay from time to time. There is on on Craigslist here in Seattle now.It looks like the relay box is intact. I will have to see if they have the control box.
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There were two dudes in the late 60's and into the 70's that had these. I do remember seeing them very frequently and talking to people running them. There is still remnants of a few withering away on masts.
The one old man was a friend of my dad's. We visited often, he bragged about it. I do recall reports of relay problems, but when they worked, people loved them. I myself, would rather have a 3 element Yagi, or preferably, a PDL.