Well, I've got DirecTV, so I'm not quite up on everything Dish, but you might want to contact the STB manufacturer's tech support to make sure everything's kosher with the noise.
Fox - B-52 taking off from Fairford
That clicking sound is probably one of those cheesy little relays some devices use when they connect to the phone line.
Nik
Thanks TofL. Will do. Checking CNN (PFFFT!) now...