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I'm surprised you've never heard of them. It was being crowed about all over radio and TV a few years back during the DTV transition.
It is sort of like a cable box for over the air(only once you buy it you don't have to keep paying to use it). They stopped nearly all transmitting of TV signals in a format that set can naturally receive a few years back...Soon there will be nothing transmitted in a format that set can tune on it's own. Basically all over the air TV signals are digitally encoded nowadays so that HD and or multichannel SD broadcasts can fit in the bandwidth of an old analog SD channel only problem is that older sets were not designed to decode this signal.
A converter box basically tunes the digital signal, decodes it and converts it into the type of signal your set uses. You do have to connect the RF out of the converter box to your set for it to work though.
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