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I have also found the CM341X amplifiers to be very capable when faced with many strong signals. The noise figure is not as good as several of the preamps on the market, but in this case, the amplifier's 1 to 2 dB poorer NF is not going to be an issue and the 2 or 3 dB additional loss in the down-lead can be tolerated as well.
I think the bottom line is, the CM-7777 is a 'fringe' to 'deep fringe' preamp. Your TVFR indicates many strong and medium strength signals which were adding up to overload the CM-7777. While a high input preamp such as the CPA-19, HDP-269 or CM-7778 may also work well, I agree with NSAA that the ease of access makes the CM-3418 a very good choice.
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