If a channel doesn't want to pay to broadcast in HD, the "sane" thing to do would be to show 4:3 footage "full screen" and letter box the 16:9 footage. That way you have a single pillar and letter box on the 16:9 and just pillars on the 4:3. Not a bunch of nested borders. But really, why have a non HD channel in this day and age? Does anybody even have a non HD TV anymore?