I'd go with
@winston1's suggestion that there's too much gain from that amp.
I'm on Winter Hill too. My place is in Middlewich. WH is 31 miles away. The signal predictor at
Wolfbane tells me that for my location I need a high-gain aerial with additional amplification. That's not my experience. My Log has been up a while. It's a full-sized 470-862MHz aerial, and so predates the newer Logs with use narrower bands following the various RF channel clearance events. As such then, the aerial is relatively low gain, and there's no additional amplification on it.
My signal is perfect for all the SD and HD muxes with the exception of the low power (1000W)
That's Manchester service (RF ch56, 754MHz). I do pick up the 2000W Liverpool version though (Bay TV) also on RF ch56, 754MHz. The signal level on all the muxes is easily strong enough that I could split at least 3-ways with a simple passive splitter, so no amplification is needed at all.
I supply the local narrowboaters with aerials too. Although I recommend a full-sized Log where possible, quite a few opt for the shorter mini-Log but still get decent results here.
Your Philex brand aerial with its additional amplification of 24dB is a hell of a lot of boost. The tuner in most TVs has both an upper- and a lower- signal level threshold. Amplifying the signal too much is just as bad as having a poor signal level. If you wanted to, you could try a 1-20dB variable attenuator on the signal output going from the power supply going to the TV. Toolstation does the ProCeption one for less than a fiver.
LINK I would suggest this as a test rather than a permanent solution
. (Note: The attenuator stops DC power, so if you were tempted to try it on the wrong side of the power brick it will kill the juice going up the aerial amp so you'll get no signal at all.)
In answer to your question
"But am I correct that in theory this should work." IMO, unless you're in an absolutely terrible signal spot, then the answer is no because there's just too much amplification even for a "medium" signal area.
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