In my area, Your Nation's Capital, the stations are broadcasting a mix. Network prime-time stuff is pretty much all 16:9, but local stuff, including news, is 4:3 for all but the CBS affiliate. Commercials seem to come in a variety.

One of the things you need to know if you are using a new converter with your home theater is that the converters do not generally provide more than stereo audio. The assumption, which is correct, is that the older sets cannot do more, and anyone interested in HT will get a new set capable of 5.1.

For my HT setup I have an LG 4200a box I bought on eBay a while back. I am still using a digital wide screen computer monitor for a screen.

Bob