its piggy-backing onto the 3-NBS system as you go up and down. As someone on that systen living not more than 500m from the Cork line you can move from one end of the kitchen table to the other and lose the signal unless you have a booster box.
during the summer, if it is windy, the hedge can feck up the signal.
so if you are on one side of the track, good-bye signal.
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