I'm staying in condo... so its a centralized antenna.

Then contact your condo management, chances are they didn't replace their hardware for the centralize antenna for the new frequency
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...