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The first obvious thing to do is remove the distribution amp and place an amplifier at the antenna mast. That should improve your SNR by 1-2 dB.
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Probably closer to 3 dB since you'd be eliminating the 5.5-6 dB/100' insertion loss of RG6.
The device called the HLSJ will split/combine FM/low-V from high-V/UHF. They're getting harder to find, but they're out there. Look for Holland or Pico (Steren) names.
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Can I combine a UHF/Hi-VHF antenna (DB4.DB8)
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The DB4/DB8 antennas are UHF antennas. They are quite nearsighted on lower frequencies than they were designed for.
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I'm not even sure the a pure Hi-VHF antenna exists.
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Sure they do. We've been making and selling our ClearStream 5 for 5 years. It was purposely designed as a VHF high (7-13) antenna. There are others.
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Would a simple dipole FM antenna work for my Lo-VHF needs?
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It would likely work better than a 751 on low-VHF. However, since KJWP (
http://www.rabbitears.info/market.ph...n=kjwp#station) is now on the air, you might want to consider the 5-element low-V antenna already suggested if you'd like to include that station combined with the 751 via an HLSJ or simply going to the CS600 for 2-13 coverage any using either a UVSJ or the input of the RCA pre-amp to combine.
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RE: Allentown RC46 (36degT).
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I'd suggest a simple UHF Yagi. Good, focused beam with extremely sharp nulls at 90°. Plus, they're long but not very tall, a good choice for a height-limited attic as compared to a 4 or 8 bay UHF antenna. Actually, I'd suggest getting two of the same model and make a proper 90° UHF-only array (two equal length cables plus a reversed splitter), then combine with the CS600 using the RCA amp. The 751 gets "re-gifted" to someone else.
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.thus lett me using a simple combiner/splitter. Sound right?
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When the angles are 90°, combining with a reversed simple splitter has about the best odds of working, but it's still a crap shoot, especially in an attic, due to signal reflections that still might make it into the undesired antenna. You will loose about 6 dB of signal from each antenna so keep that in mind. Worst case is that you'd need a custom, single channel combiner which would likely run $125-150 which would limit combining losses to less than a dB or so.