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The wiring also distributes the signal across half a dozen rooms which I assume (no idea if it is the case) degrades the signal
You lose amplitude (3dB in a "physics problem", more like 3.5dB in a practical circuit) every time you split the signal, which is why splitter/amplifier (aka distribution amplifier) is still a thing. Six outlets from one aerial needs three passive splitter stages on some outlets, which is -10.5dB. Whether that's a problem is a matter for practical experimentation
gbj_tester
Cheers and @gbj_tester Will have a look at what other people on the street have.
The loft is boarded out and used for storage so would prefer not to lose too much space to an aerial. I guess I could try and squeeze it under the eaves or the secondary loft where there aren't any boards but access is more awkward and I might need to extend the wiring.
The wiring also distributes the signal across half a dozen rooms which I assume (no idea if it is the case) degrades the signal.