I think it would depend on if your Dish account is still active. Even though it has an ATSC tuner the receiver isn't going to work unless you have an active Dish account. Your manual should even state that.
Actually the 811/381 receiver can be used as an OTA only receiver without a subscription but it must be connected to the dish and receiving a signal. As a bonus if you have the dish pointed at the satellite that carries your locals you will even get guide info for your OTA channels.
Another trick I've learned if the unit isn't working on off the air channels due to expired time issues even on a closed account,If you connect a telephone line to the unit for 24 hours it will automatically fix the basic OTA functions.
This works on Dish and the older DirecTV HD equipment.
I havent had the 811 activated for over 2 years and it still work fine. Mine has the old yellow card so all the "free" chanenls (101, nasa, angel one) say "need new smart card" but it still gets the OTA