Btw just to give you a picture on what kind of works that needs to be done by the contractor.

See the "C49" sticker on that equipment? That is to indicate to the technician/contractor where that equipment is for Channel 49 - 698MHz; so that viewers can receive DTT signals for 698MHz CH49 which is Mux 2 channels that consists of RTM channels.
Because 698MHz no longer in use, so that entire particular equipment (the one with the C49 sticker on it) have to be change/replaced into another piece of same exact equipment, but has been preconfigured as 650MHz Channel 43, so that the viewers in that building (connected to centralised antenna) will be able to receive 650MHz signal from Mux 2. That equipment cannot be retuned/adjusted/reconfigure) or whatsoever (the most is just power output levels or something like that).

So after removing the equipment that is preconfigured to 698MHz, what can you do with that then?
Unless if MYTV uses back Channel 49 698MHz (which is impossible), then only you can use back. Otherwise, there's nothing you can do. Throw away, or send to recycling centre maybe?
Maybe can use it in hotel TVs where they can distribute their in-house or Astro channels through in-house DTT or cable TV to hotel room TVs. Not sure, just guess.

Now I know how nightmare it is for centralised antenna contractors where they have to go replace all of this same equipment again on every single buildings that uses centralised antenna around the region when there is a frequency retune exercise again in the future.
The above photo and information is provided by one of the centralised antenna installer that I got to know him through online.

If you are an centralised antenna contractor, and if I might provide inaccurate info, do correct me with right info. Cuz I'm still not fully familiar with centralise antenna yet, but still learning though...

Even if it is free, the picture quality of RTM HD channels is quite mediocre with around 2.5Mbps video bitrate available (not a suitable bitrate for 1080i HDTV broadcast), looks very like what you can see on YouTube (even sometimes YouTube videos looks much better if the uploading source is good). Slightly complex scenes already causes the text in the crawler bars to look blocky. When compared to DTT channels in Singapore (which has better quality) ours RTM looks like "ada gambar sudah".

Astro's audio bitrate is:

64kbps HE-AAC for its Stereo tracks in HD channels
384kbps/448kbps (few channels only) AC3 for its Dolby 5.1 track in HD channels.
224-256kbps E-AC3 Dolby Digital Plus audio codec is used for UHD channels.
192kbps MP2 audio for its SD channels and radio channels.

It depends to the policy of MYTV if they want to activate third MUX or not. Given the number of channels available on MYTV DTT, it isn't cost effective for MYTV to activate 3rd MUX yet even if the option is available, as there are still plenty of space available on both MUX 1 and MUX 2.

I also get 90+ on the signal strength at some point but quality remain at 0. What is the correlation  between both?

So a good signal with almost no interference will look like a sharp cliff-like mountain, while signal with interference will look like entire graph very messy? Something like that?

But the thing is, what if consumers don't have equipment to check the spectrum analyser?
Strength high high, but Quality 0%?
And, if Quality reading is not 100%, maybe barely like 50-60%, but Strength also somewhere there, does it means there's some interference/data errors?

That's probably for Analog TV?

But higher signal strength = more stable signal( and less likely to be disrupted by rain?)