^^^
Not a radio-astronomer, but I read somewhere recently that radio and television waves degrade significantly with distance. At one light-year, they're 1/2 strength, at 2 light years, 1/4 strength, and so forth to the point where at any likely distance that there is other intelligent life, our TV and radio signals are indistinguishable from background noises. Thus, it is unlikely that the Thermians are watching reruns of Gilligan's Island and thinking that it's Earth's cultural history.
Even if a species were flying by in an advanced spacecraft, would they bother to stop? On a hike, do we stop at every anthill and try to communicate? Unfortunately, I think its far more likely that they would strip mine the planet or demolish it to make way for an intergalactic on-ramp (and no, I didn't find that book particularly funny).