How about adding another DB4e with two short coax cables and a combiner? I've been toying with that idea, as I'm getting a couple of channels I shouldn't be able to using a single antenna in my attic, though not reliably (some days perfect, others not at all), and an increase in signal strength from a second DB4e may be enough. Essentially a DB8e, but since I already own one half, I may try another, which I can also take with me when I move next year, leaving the original and all that wiring for the new owners.
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