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You do not have crap on your scope. What volts/div is your scope set to? I think it may simply be you need to feed a stronger signal into the scope.
You should also terminate the end of the RF out cable. I assume with 50 ohms. The original RF out cable likely had a termination pod with little alligator clips.
Or maybe there's something wrong with the scope. Does it produce a sharp bright line when there is no signal?
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