AVS Forum Club Gold
Join Date: May 2002
Location: Evanston IL 60202 11 mi from Chicago transmitters
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If the cables are all right, the diplexer loss, though small, may be crossing over the edge of good/bad signal. In that case, you can try, in order of signal improvement preference, getting the antenna outside, trying an 8 bay antenna like the 4228, getting a better preamp like a Channel Master 7775 (7777 to future proof against the time when a local station may go back to VHF) or Winegard AP-4800 (AP-8275).
While I may link to and mention products as examples, I don't recommend specific products.