I have to apologize for the briefness of this page, but I will get around to filling it out in time. The Navy ARD receiver was a niche capability that came out of a ceratin amount of desperation, as you can see from the equipment. At the same time, it exhibits the best of the technology that was available at the time.
The receiver portion of the system.
The slide tuned antenna. Various length stubs were screwed into the open hole on the left end to match the anticipated frequency of targets of the particular ferret mission.