Saab seems to have covered all bases but I have a friend who'd just gone over to Talk Talk and links his TV and other odds by this method. I raised this issue the other day, and he was surprisingly confident. However, I got the impression he was rather relying on the distance to the next house and it's damping effect on the higher frequencies etc., so I'll broach the subject again. He was an electronics design engineer and teacher, so I don't know why he's not more worried.
I'll certainly be relaying Saab's information to him.