I've had a 16:9 RPTV for 4 years but have never used it for anything but DVD watching. It's never even been hooked up to cable tv. Today i'm going to hook it to my cable box, and i'm wondering about magnestism problems. Are these boxes magnetically shielded so that you can put them on top of the tv, or do they have to be kept a certain distance away to avoid damaging them. If so, how have people done this? Thanks!