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I suspect this schematic is a joke or a classroom exercise. There are several things "wrong with this picture". 1. The antenna circuit feeds the grid of the video amp. Where's the detector? No RF or IF gain at all says there's just not enough dBs to get anything done. The video output taken off the screen grid. The horizontal oscillator/output would be modulated by the video and the reverse.
Don't take it too seriously. It is not intended to work.
Don
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