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It's the TV set's tuner. You're probably going to have to go to extra lengths to feed it a better quality signal, perhaps at a higher power level. Older, early generation tuners were far less capable of handling quality-impaired signals, especially in regards to multi-path than were subsequent generations of tuners.
I may sound like a broken record, but, if you get your C4 out of that attic, your reception will almost always improve. Since the problem with the RCA is undoubtedly short-delay multipath, the attic is likely the biggest contributor as signals are probably echoing around up there.
One other point is that WBBM would benefit from strapping on a VHF dipole (intended for the C2 but will help a C4) to the reflector. Email us at info (at) antennasdirect.com for the tip sheet.
As an additional troubleshooting step, bypass all those splitters (use F81 couplers) to have a single coax run to TV #3 and see if that helps it any.
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