With this 30-pin accessory, you can watch live TV broadcasts on your iOS device.  You don't need WiFi access, and you won't use your data plan minutes, either.  You do need to be in certain geographic areas in the US to use the Dyle mobile TV unit from Belkin, though.  Dyle mobile TV broadcasts live local programming from major TV networks and  uses the ATSC-M/H standard.  To find out if you are in a coverage area, check Belkin's coverage map.
The Gadgeteer , Watch over-the-air TV on your iOS device with the Belkin Dyle, Watch over-the-air TV on your iOS device with the Belkin Dyle