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I use that same model RCA color bar generator. I never use the individual gun controls however. The gray wire sounds like the one that should go to the antenna terminals. I believe it is a shielded wire. There should be a small resistor network (using 120 ohm resistors if I remember correctly) at the end with three wire clips coming out of it, two for the antenna and one for chassis ground. I can send you a photocopy of the manual and schematic if someone else doesn't post with the info before I get home tonight.
Steve
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