Good tip, I already did that = same result.
It,s just very puzzling that the Mag's internal splitter/amp goes both ways. And plugging into the OUT, although it reduces the signal strenght on most channels, actually performs better on a specific frequency (UHF 32) vs the "IN" which eliminates that same channel, while allowing another one on UHF 43 which doesn't come in at all when connected "OUT".
You'd of course assume connecting in the "OUT" is all wrong... but for some reason it's not necessary the case depending on the incoming signal.
Both these channels don't have adjacent or co-channels.