Sparks

I have never done much with the small portable TV sets so I am not really familiar with a possible antenna hookup. I have seen wrist watch TV sets and I would not think it very likely that they would have an external antenna connection.

As far as how old the TV could be. I would not think it practical to use a TV that is more than about 30 years old. TV sets back then and older were the tube type sets instead of the solid state systems. The vacuum tubes have a fairly short life expectancy sort of like a light bulb. I do not think that vacuum tubes have been made by any company for several years.

Remember that all a converter box is, is a tuner. It receives the digital signal and converts it to an analog signal. Any analog TV can receive it no matter how old it is as long as it can receive channel 3 or 4. The converter box places no load on the TV nor does it make any demands of the TV set. All that may be necessary is to convert or adapt a wire to connect to the TV set from the converter box so that it can receive the analog signal. If a TV has a built in antenna with out a connection for the antenna wire. It would then be necessary to connect the converter box to a small device that will re-transmit the analog signal for a very short distance. Then any nearby analog TV set with a built in or portable antenna could receive this signal.

I do not know if any company is making a transmitter as I described for TV video at this time. I am certain that you have already noticed that this is common place with home theater and surround sound systems for the audio portion only. That is how you could place some of the speakers around the room without any wires being connected to them.