Mobile DTV is a dialect of the new ATSC digital television standard that replaced the old NTSC video system.
The original ATSC specification didn't allow for the possibility of mobile devices (doh!) and so a new specification was hastily created and rolled out in October 2009.
http://gizmodo.com/5383507/america-finally-has-a-mobile-dtv-standardThere are some stations broadcasting with this standard:
http://www.openmobilevideo.com/About 40% of the US Population is covered to some extent by Mobile DTV.
Note that a portable ATSC television - IF it's not moving - works just fine if it's in reach of the notoriously finicky digital signals from the ATSC transmitters. You can get a portable ATSC TV at places like CVS stores for about $100 or less.
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