Television channel
From Tardis Wiki, the free Doctor Who reference
The Eighth Doctor claimed that the TARDIS scanner could "tune in" to every television channel broadcast on Earth. (PROSE: The Dying Days)
When the Sycorax transmitted their message announcing their invasion of Earth on Christmas Eve 2006, (TV: The Christmas Invasion) UNIT's Sgt Catherine Petts claimed that the aliens had started their own TV channel. (PROSE: Guinevere One)