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.
Forecast high winds cancel three ferries
This evening's 7.15pm ferry from Douglas to Heysham has been cancelled.
New Iranian ruler tied to Manx-registered company
The new ruler of Iran is reported to have built a global property empire with the help of a company based on the Isle of Man.
Temporary speed limits around TT course from this week
There's temporary speed limits around the TT course for over two months from this week as the Department of Infrastructure gets ready for the races.
Government considers laws for BYOB events
Justice and Home Affairs Minister Jane Poole-Wilson says her department's currently considering whether new laws are needed to cover Bring Your Own Booze events.
Police warn about bad behaviour in school - by parents
Police are warning parents to behave if they go to schools - or face a fine.
New fashion outlet for Peel this weekend
A new shop will throw open its doors in Peel this weekend.
Weather warning for gale force winds
Ronaldsway Met Office has issued a yellow weather warning for gale force winds tomorrow.
Politician raises questions about student loan changes
Onchan MHK Rob Callister has raised two potential changes to student loans, in questions to a minister.
