My AM-21 Is a big disappointment freezes, my HR21 all the time when ever I record from it.. I have signal strength of at 100% for both tuners for most of my stations and just under that for the rest.. But I do not think it lives up to its expiations.. I got my for free I had to call the retention number for DIRECTV, I paid $50.00 for it no shipping No tax and I am getting $10.00 a month credit for it for the next six months… I am glad I got it for free I would have been bitching more If I had to pay for some thing that really did not work.. The picture is outstanding when I watch local channels when a big thunderstorm moves thru my area, but I can not as I said record any thing form it!!!