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Be sure you're not, say TV on channel 3 and the signal generator on channel 4. That can make the video look like trash. Or maybe the fine tuning is way off. If you are trying to tune in the lower sideband (most generators and VCRs don't bother to filter the lower sideband) your alignment will look totally jacked.
Try a VCR in place of the generator, to be sure that it's not a fault in the generator. Or try the generator on a known good TV set.
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