Old TV with built in tuner - where is signal coming from?

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Puzzle here.
trying to help a relating with an old Sony bravia TV. sony bravia kdl-26v4000 (has built in digital tuner).
trying to help a relating with an old Sony bravia TV. sony bravia kdl-26v4000 (has built in digital tuner).
The picture quality has deteriorated- looks like the signal is weak or interrupted on the digital channels. The only cable connecting the TV is the power lead and one analogue Co axil cable going from the TV to the wall. There doesn’t seem to be an analogue signal being received. I tried changing the cable, while unplugging it, I’ve realised that the digital channels still work. So where can the signal be coming from??
Any ideas to improve that signal gratefully received. Though my puzzle is where the signal is coming from when the only cable is the power lead?
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Then, when you plug the lead back again the digital channels continue to work but there is no improvement?
FYI - that lead feeds the digital TV signal from your TV antenna on the roof into your TV. It used to feed analogue TV signals too, but these have been discontinued and there aren't any.
With our TV we can pick up some channels with no cabling, a little better with the aerial connector (its corroded to hell so no surprise little improvement) and totally different world if we connect the satellite cable to the freesat tuner that the TV also has.
These days watch most things via the internet/apps
The fact that plugging in the antenna cable makes no difference points to an antenna problem. Either try an indoor antenna if you have access to one, or get the TV man in to go up and fix the antenna problem on your roof.
thanks for all your help.