I suppose it's possible, but if I were the NSA I wouldn't bet on getting a signal past the neighborhood distribution transformer. There's often enough disturban

I suppose it's possible, but if I were the NSA I wouldn't bet on getting a signal past the neighborhood distribution transformer. There's often enough disturbance on a building-wide circuit to cause problems with powerline networking. Your 42" LCD TV probably has enough power-conditioning circuitry to interfere with network signals.