The signals in your area are far too strong for a high-gain amp like the CM7777. Here's a simple rule of thumb: If there's any green on your TVfool plot, do not use it. You can probably pad down the input with some attenuation and use it anyway since you already have it on hand. Get a couple of 3 and 6 dB attenuators and have at it. Or, just return it and get a medium gain amp that can handle the moderately strong signals.
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Can a preamp with only a single input be used with a splitter/combiner that is combining two antennas?
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Sure, we do it all the time. Here's a diagram I did a couple of years ago that demonstrates it in a generic manner:
https://www.antennasdirect.com/cmss_...e_Antennas.pdf