[jaycee]

Thats quite true! Personally I avoid this by having no aerial connected - I don't see the point when you can get all of the terrestrial channels via cable anyway!

Also, another thought, if he is tapping the signal directly from the omniriser, the odds are that he doesnt have an isolator before the feed connects to the digibox. Again, the isolator would prevent an earth loop forming, this time between the earth in the streetside cabinet, and his own premesis earth.