I'm somewhat confused. Each ATSC channel is a fixed 6 MHz wide spectrum. They can either do one HD channel or four SD channels (I think but I cannot find solid technical info on TV broadcast except very general info that is aggregates of what everyone else posted, or very esoteric technical specific). I can get MPEG2 is high bandwidth and not that great compared to H264 but MPEG2 continues on because that's the way it is (like DVDs).
I was talking with someone who gave additional reason to cut cord from Comcast is HD from OTA is far superior than on cable which is highly compressed to transmit all those channels down the coax.
Speaking of technical, it was only recently you can easily find actual frequencies used by TV stations (needed if you are using UHF wireless mics). After the DTV transition, I could not find actual frequencies used which drove me nuts because those that say it is same as NTSC are wrong (well yes and no, digital channel is same freq as NTSC channel, but stations go by virtual channel which many are different). Get the freq here,
http://licensing.fcc.gov/cdbs/... put CA for state to show all broadcast TV stations in Calif.
for this diatribe, here's the data of these two stations from FCC site (freq from old school NTSC channel):
both stations are Full(DT) in Los Angeles
Call Sign KLCS
Virtual Ch 58
Digital Ch 41 [632-638 MHz]
Licensee LOS ANGELES UNIFIED SCHOOL DISTRICT
Call Sign KCET
Virtual Ch 28
Digital Ch 28 [554-560 MHz]
Oh well, for you all RF types (yes, there is a low power NTSC station on analog ch 6),
Call Sign, Virtual Ch, Full/Low Power, Digital Ch, Licensee
KABC-TV 7 Full(DT) 7 ABC HOLDING COMPANY, INC.
KCAL-TV 9 Full(DT) 9 LOS ANGELES TELEVISION STATION KCAL LLC
KCBS-TV 2 Full(DT) 43 CBS BROADCASTING INC.
KCET 28 Full(DT) 28 KCETLINK
KCOP-TV 13 Full(DT) 13 FOX TELEVISION STATIONS, INC.
KEDD-LD - Low (LD) 50 VENTURE TECHNOLOGIES GROUP, LLC
KFLA-LD - Low (LD) 8 ROY WILLIAM MAYHUGH
KHIZ-LD - Low (LD) 2 JEFF CHANG
KHTV-CD - Low (DC) 27 VENTURE TECHNOLOGIES GROUP, LLC
KIIO-LD - Low (LD) 10 BAGRAT SARGSYAN
KLCS 58 Full(DT) 41 LOS ANGELES UNIFIED SCHOOL DISTRICT
KMEX-DT 34 Full(DT) 34 KMEX LICENSE PARTNERSHIP, G.P.
KMRZ-LD - Low (LD) 22 VENTURE TECHNOLOGIES GROUP, LLC
KNBC 4 Full(DT) 36 NBC TELEMUNDO LICENSE LLC
KNET-CD - Low (DC) 25 NRJ TV III CA LICENSE CO., LLC
KNLA-CD - Low (DC) 50 NRJ TV III CA LICENSE CO., LLC
KSFV-CD - Low (DC) 22 VENTURE TECHNOLOGIES GROUP, LLC
KSFV-LP 6 Low (TX) Analog Ch 6 VENTURE TECHNOLOGIES GROUP, LLC
KSMV-LD - Low (LD) 23 KJLA, LLC
KTBV-LD - Low (LD) 12 EICB-TV WEST, LLC
KTLA 5 Full(DT) 31 KTLA, LLC
KTTV 11 Full(DT) 11 FOX TELEVISION STATIONS, INC.
KVHD-LD - Low (LD) 40 NEW YORK SPECTRUM HOLDING COMPANY, LLC
KWHY-TV 22 Full(DT) 42 KWHY-22 BROADCASTING, LLC