1. Thread moved to the correct section.
2. There's no such thing as a 'digital aerial'.
Aerials/antennas cannot tell the difference between analogue and digital. They are just designed to receive signals of particular frequencies/bands.
Now to the actual issue...
Has there been any storms/power failures where the transmitters for your area are located?
It's possible transmitters are off air, so re-scanning will not find signals that are not there at the time.
If your friend also receives TV signals from the same area transmitters as you and has also lost reception.... that's a good indication it's a transmission issue, not a reception problem.
If you have re-scanned and not detected channels, you will have erased the previous channel memory of your TV.
Check with neighbours if they are experiencing any reception issues.
Also try re-booting the TV... unplug from power, wait a few minutes and turn back on.
After confirming all TV channels for your area are actually transmitting, re-scan.
Note my previous comment re: lost memory... you will need to re-scan.
To test incoming signals at the antenna, you will need a digital signal meter/analyser.
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