I made that point because you can't necessarily tell how much is on a single RF carrier by channel/subchannel numbers anymore. For example, in DFW, Univision has four subchannels, Unimas has three, and local station KTXD has five. Each station has one HD channel and the rest are SD. So, three RF carriers, right? Well, it used to be, but not anymore! Currently:
- 23.1-23.3, 49.1, and 49.3 are on RF 33
- 23.4, 47.1-47.5, and 49.2 are on RF 23
The .1 channels are the HD ones, so we have two HD and three SD channels on one carrier, and one HD and six SD channels on the other.
Relative to other cities, this isn't a bad situation. It's the only channel sharing in DFW (except Daystar, but that's just one HD and one SD channel on the same carrier), and it doesn't look too bad on a typical TV screen. (And this wasn't even due to the Digital Dividend auction; this was done to free up an RF carrier for ATSC 3.0 testing.)
It'd probably look a lot worse on a 125" screen though
And many TV markets are in a lot worse shape than DFW. Two or more HD + four or more SD is disturbingly common nowadays. When things start getting that crowded, the PQ's gonna give. (And subscribing to cable rarely helps, as cable usually gets exactly the same data stream as OTA.)
You can check your locality out at https://RabbitEars.Info
and see which stations (if any) are sharing carriers where you live.