Here is a picture of two 3 1/2 inch models. The "RCA" on the left has the "Mobile/Handheld" feature and is tuned to a M/H stream (the only one in the area ).
The "myGOtv" on the right is tuned to the HD stream from the same channel. The M/H stream lags behind the HD stream, likely it has more robust error correction. The RCA tunes DTV and M/H streams, while the myGOtv tunes DTV streams and NTSC channels. Both sets work fairly well close to the transmitters (like 15 miles or so) and the M/H set *will* work fairly well in a moving vehicle (on the one M/H channel in the area). Please pardon the reflections on the screens.
jr