Remember those stupid "Get TV reception from the powerline" adaptors?

[wa2ise]

Rememer the ads in "TV Guide" for devices that claimed to use the power wiring of your house as a TV antenna for TV reception? They were usually a plug in plastic cube with a plastic cylindar on top, and had twin lead coming out of it to connect to the TV's antenna terminals. At best they may have had a capacitor coupling to the powerline. Some had no connection at all; it just had the twinlead stub stuck into the plastic cylindar. These were likely intended for city people living in apartments not far from the TV transmitters. Where even a wet noodle would work...

At first the wall wart in the picture looks like a modern version, with the F connector on the side of it. But it's not. It's just a 12VDC 150ma wall wart. Who knows why they selected an F connector for the output jack. :-)