Not so fast!
If it is reasonably simple to put up an OTA antenna, I would ALWAYS recommend it. AND I would always subscribe to locals through DISH.
1) subscribing to Dish gives you access to program guide info, which is invaluable.
2) Over the air gives you access to subchannels that Dish does not carry. Most are CRAP, but some are mildly interesting.
3) For all channels EXCEPT CBS O&Os, OTA picture quality will be better provided you get a signal strength higher than 70 or so. This is because Dish does reduce the bit rate on every other local HD channel they rebroadcast. By Contractual agreement with CBS, Dish does not reduce the bit rate of CBS owned and operated stations and in Chicago, the Dish picture of CBS is pristine.
In particular, here in Chicago, the ABC and NBC station HD signals on Dish just Suck. Much better and more reliable OTA.
4) For those times when you get "Rain Fade" on satellite channels, you will still be able to see the local stations.
5) If you have a DVR (why a 211?) you can record 3 programs at once with OTA.
6) With OTA, You can get PBS and Independent locals in HD. Dish does not carry Channels 9 and 26 where I live. Without OTA, I would miss many Cubs, Sox and Bulls games in HD that are broadcast on these outlets.
7) If you are one of those people that likes to turn the sound down on network NFL broadcasts and listen to the home team description on Radio, you can do this with OTA because it is not subject to the 23,000 mile delay.
8) When you set up the antenna, go for a signal strength in the 80s on all channels at a minimum. When it rains, the signal strength drops about 10-15%. If it drops into the mid 60s, you will lose the picture.
So doe some research on antennaweb.org and get a ladder!