I had to order two boxes for my dad.... Like anything else, the boxes are NOT created equal, you might want to do some research before buying... Based on my research, this is the box I purchased for him:
Channel Master CM-7000 Digital to Analog TV Converter Box
It appears to be out of stock right now.... He lives in a rural part of Wisconsin, and all of his channels have already converted.... He tells me that with this box, he got all of his local channels back, as well as a few he had not received before....
I got the coupons from the government program.... One I was able to use on Amazon, the other - for some reason - kept getting rejected when I tried to order the box. I verified with the agency that issues the coupon that it was still good (they told me Amazon seems to be having trouble with their verification process), and then I contacted Amazon, and they refunded me $40 on the second purchase.