Digital terrestrial TV services such as Freeview come to your TV set via an aerial. Ideally this should be mounted outside and as high as possible. You may also get good reception if it is inside, for example in the loft, but a set-top aerial may not be satisfactory.
To get the best reception you need to make sure that your aerial is in good condition and is pointing towards the best local transmitter. An outdoor aerial can deteriorate or be knocked or blown out of its correct position, and cables and connections from the aerial to the TV set can become corroded. Older aerials, cables and connections may need replacing, especially if you live near the sea where corrosion can happen quickly.
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