Police are investigating damage caused to the fencing surrounding the mast on the Snaefell summit.
Officers believe due to the nature of it, it hasn't been caused by adverse weather.
The constabulary added it's happened sometime between Friday, February 22 and Thursday, March 28.
Anyone with information is being asked to get in touch with Police Headquarters.
Social media flooded with complaints about public toilets
Air ambulance charity makes desperate appeal for another helicopter
Fire crews spent hours dealing with serious floods earlier
Yellow weather warning to run until Thursday
Focusing on crash blackspots is outdated, says minister
Minister hopes to improve bus wheelchair and scooter access
Michael Dunlop gets his MBE from the King
More fibre telegraph poles for Ramsey?