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I suspect preamplifier overload. If a pre-amp is truly needed I would only consider the Winegard HDP-269. Make sure the system is well grounded as the 269 is sensitive to nearby lightning strikes.
The 91-XG can pull in stations down to around 0db with no amplification in most instances. This is even possible with 100 feet of coax & no splits. This may require a bit of height tweaking (in 6 inch increments) if the antenna is pointed directly into any obstacles.
Every antenna I have tried at my location requires a rotor even though the desired stations are in the same direction. Any trees, houses or hills in front of an antenna can create a tremendous amount of signal reflections (mutipath). An off axis aim may actually work better under these conditions with affected channels.
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