Many thanks to SWLing Post contributor, Paul, who recently shared a link to this Craigslist listing and asked if anyone in the SWLing Post community might be familiar with this Beam Box Electronically Directable FM Antenna.

He included a link to the following review in an archived issue of Radio-Electronics:
https://worldradiohistory.com/Archive-Radio-Electronics/70s/1978/Radio-Electronics-1978-03.pdf

The Cragslist post actually included the following images of the owner’s manual:

I’ll admit that I’m not at all familiar with this antenna, but I see how it might have been ideal for a component system. I’m curious if it was FM DX-worthy!

Please comment if you’ve ever owned the Beam Box!