Hi Paulo.
I gather from your name that you are probably Portuguese but I'll keep the conversation in English to allow for more comments from the community.
At the time of my previous testings I had NOWO provider and both USB sticks sucked big time. NOWO uses DVB-C and their signal is usually weak.
But the issue way mostly with my setup. Somehow the Astrometa stick works fine on Windows but sucks on Linux. Some say it's the driver/firmware that on Linux doesn't enable the internal amplifier that comes with the stick whereas the Windows driver does that trick.
I'm not saying it worked perfect on Windows, but on Manjaro Linux it kept breaking and showing macroblocks and other artifacts.
But I was using Linux on an old PC whereas my intentions were to go with a small SBC such as a Pi3 or Pi4.
So I took my Pi3 and suddenly realized that the Linux that comes with the Pi sucks and that it doesn't come with Kernel > 5.0.
Correction, most Linux distros out there still don't come with Kernel > 5.0 and that completely ruined my plans because Kernel 5.0 is needed because otherwise the Astrometa stick doesn't initialize the tuner and it doesn't work.
I've put the project on hold since then. I am either picking it up again when Kernel 5.0 becomes a standard or I'll have to buy a DVB stick that is more expensive and has drivers on Kernel <= 4.x.
EDIT:
Oh, forgot to mention: NOS and NOWO both use DVB-C. MEO and Vodafone both use DVB-T. Some say that some NOS customers that have real FTTH (real Fiber) delivered to their apartment are already using DVB-T too, but these are very few Lisbon customers. I'd say that more than 90% of their customers are still on Cable, which means they still have DVB-C.
And this is very important because the Astrometa needs Kernel 5.0 to initialize the Sony demodulator, which I think is used for DVB-C and DVB-T2. But the Astrometa also has another tuner which seems to support DVB-T and which apparently works with Kernel 4.0
I still haven't tested it with Kernel 4.12 and DVB-T from MEO (switched from NOWO to MEO in the past couple of months).
I'll test and will let you know soon. If this works, I may resume this project sooner than later.
Hope these comments help you make your own decisions. And please share your thoughts if you find alternatives.
Cheers