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Does the Directed Electronics Sirius outdoor antenna (model #14240) need to be grounded? TV antennas and satellite TV dishes do, but the installation manual I downloaded from Crutchfield doesn't say a word about grounding. Assuming the answer is "yes," my next question is how? Where would I find...

My house was built in the 1970s. It originally had a TV antenna somewhere on the roof, and the builder installed three small metal conduits that penetrate the roof and lead down into three rooms (the living room and two of the bedrooms). The wall plates in the rooms suggest that 300 ohm twin...