Already got offical reply from HDB, it is not allowd to remove the conduit. " 2 Under the existing renovation guidelines, the original television points provided cannot be tampered with and must be left accessible for future maintenance. 3 We noted that the TV system provided in your block is a loop system. The removal of TV point could affect the TV reception of the lower floor units as well as the signal qualilty for the whole stack. As such, we regret to inform you that the TV point in your flat cannot be removed."