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The FCC allows a maximum radiated power of 100 mw. This won't cover a whole house, but will work within a rooom. You can find devices that broadcast TV on ch 3. with that power on Ebay.
It is very easy to connect sets using coaxial cable and splitters. Hook your channel 3 signal source to one of the 20 db VHF amplifiers that are sold at Radio Shack and you will have plenty of signal to feed at least 16 sets.
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