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Given that you need a preamp to make the HD stacker work well tells me that it isn't enough antenna for your situation. The proper antenna(s) should be receiving the desired stations with no amplification to 1 TV (with 100 feet or less of coax cable).
On the cheap, I would first try the preamp suggested by Tigerbangs since the 8700 is likely being overwhelmed by the strong locals. Try a couple tweaks with height if you still have reliability issues. (Both higher & lower 6-12 inches)
If that doesn't provide satisfactory results, replace the stacker with the proven Winegard YA-1713 / 91XG combo. (Combine the 2 antennas with a UVSJ) You likely won't even need a preamp, but will still be able to use the HDP-269 if one is truly needed. You may still need the HLSJ with either scenario to help with VHF reliability.
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