Apple TV/FM Radio System - Manual (Page 67)

Setting signal range and strength
You can set your FM radio so that it searches within a certain
signal range or strength for the clearest signals whenever
you use the Seek or Auto Add features.
Choosing signal range
You can select the area—wide or local—from which Apple
FM Radio receives stations. The Apple FM Radio is preset to
receive whatever stations it can pick up, but you may
sometimes want to choose a local range to reduce
interference from strong neighboring stations (stations that
are not local).
To choose the range of the signals in which the FM tuner
searches, follow these steps:
1 Open the Options menu and choose Signal Range.
2 Choose DX to receive any station the radio can pick up.
Choose Local to receive only local stations.
A checkmark appears beside the range that is selected.
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