hi bro, i think you better remove the photo and tampering of cables post
also don't ask others to follow what you did, they might get in trouble with the authorities.
It is a criminal offence to tamper the telecommunication, scv cable, matv, fibre cable boxes points. The correct way is if you are hdb is call hdb maintennance or private call mcst management for maintennance personnel to redo/check wiring. Those cable boxes should be locked in anycase
I have read on newspaper, cases of tampering disrupted reception, tapping on neighbours line for phone calls, etc in the end got caught + fined. Just my 2cents thoughts, an antenna is rather cheap, not worth if you get caught, rather silly.
If I were you, i rewire back the original way, use cloth to wipe away fingerprints on wires, cable boxes etc and if needed ask hdb to redo or get external antenna.
Those wires hidden in cable boxes in common areas corridors, riser boxes are common property belong to hdb/mcst, if you rewire / modify internal of your home, whatever behind your main door, that is all right.
Anything you do to common property that is tampering, if your neighbour see call hdb complain, hdb investigate, letter of offence from hdb comes, then jialat liao.