How come I see VCR instructions with setups like this: Antenna's coaxial line runs to VCR's Ant Input. VCR's Ant Output coaxial to TV's Ant Input. VCR's Composite Output to TV's Composite Input. What are the compsite connections for? It seems to record/play fine without it, even if I record one channel and watch another. Does this provide better PQ quality or something?