Sorry, just now looked at this thread again
You can simply take two high gain antennas and connect them together with a short jumper
Aim one toward the broadcast towers and the other one toward your antenna
You could even use a high gain preamp on the antenna facing the broadcast towers for more gain
Commercial systems that do this are available today but back then none were around
Imagine a 30 db gain preamp receiving a TV station on a 15 db gain antenna then sending it back out through another 15 db gain antenna
60 db gain in signal level coming toward your house is huge
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