I find it amazing they could remote control something like that, that far back. Especially the level tech that went into that.
thinking about the technology of the time it's probably easier to control something that BIG, than something small and light, if you don't think so, consider that this was long, long, long before Transistors and microelectronics. Ships had Radio
rooms, not radio sets or chassis, but actual ROOMS to run basic communications and direction finding, there was no such thing as integrated circuits, and vacuum tubes were used to control the direction of electrons. thus, macro-voltages, not micro-voltages, which weould be easier to power on a ship, than, for instance, a tracked vehicle.