Techincally the dreadnaught is the furthest away but it aint a planet.
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If the signal is faint it could either refer to the psions hacking rasputin in the mars strike, if so thats worth having a look at. It could also refer to the power getting shut down in the archive mission on venus
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Could refer to Phobos. How many of us explored that first TTK mission? Few if any. That would be a faint signal when it passes behind Mars. Also what about PvP maps? Would be a new twist and Mercury is the furthest place we go. Last point, the Reef. Its further away than Mars (but not Mercury). Just some thoughts since nobody knows.