Ah, OK. So they're not uncompressed. That make more sense.Yes, levels of compression. OTA is the least compressed.
In the UK only the pubic service broadcasters have OTA (aka DTT) HD channels, the rest are SD. The bitrates for HD channels are broadly the same for OTA and cable:
I assume by "streaming" you're referring to internet services like Netflix and Amazon Prime delivered over a normal internet connection? They have the advantage of being able to deliver UHD (4k) which OTA can't (at least that's the situation in the UK).With streaming services, they can test 'live' how bad of a signal most consumers won't notice. And there are many, many people that don't see it (we have a few here).