Re. Your original question re OTA in US.
H.264 (ATSC Spec A/72) has been adopted for use with Mobile DTV (ATSC A/153 spec) enhancement to current ATSC:
ATSC was chosen for use in the US after extensive testing against the European candidate (COFDM) for four primary
reasons: 1) more robust for the same received SNR, 2) much higher resistance to impulse noise, 3) lower transmitter
power for the same reception quality and 4) Patents were owned by Zenith, a US Company,...USA, USA, USA!!!!
[Soon afterwards, Zenith sold Patent Rights to Korea for a healthy profit.....]
The current DVB-T and newer DVB-T2 systems may have reduced these differences with improved decoder chips, but
then ATSC decoder chips have undergone dramatic improvement over the past several years as well. I have NOT seen
any side-by-side comparisons of ALL of the current systems ATSC, ATSC-M/H, DVB-T, DVB-T2, DVB-H, Japan's ISDB-T
and China's ADTB-T, although there are some old tests of ATSC vs DVB-T vs ISDB-T....using antique decoder chips.
The wiki article reports that DVB-T may have better multipath handling capability than ATSC....but I have NOT seen any
tests using modern decoder chips with dramatically improved multipath performance, so take it with a grain of salt.
Work continues on ATSC 2.0, the proposed Next Generation ATSC improvement in broadcast capability:
It will include delivery of NRT (Non-Real Time) data and video programs, per ATSC spec A/103:
[Includes MPEG2 and H.264 (MPEG4), but none of the NEW proposed video codecs.]
Check out the fol. studies, esp the Planning Team 2 Report on Next Generation Broadcast TV:
After a Candidate Standard(s) is released to industry for comment, changes voted on and then incorporated, we won't
really know what is REAL and what won't make the cut. So we are still waiting to see an almost final ATSC 2.0 spec,
which is promised some time later THIS YEAR. [Maybe they'll even permit reception of ATSC and DVB-T/T2....maybe]