No one wants a leaking roof as they can cause excessive damage to your home, wall linings and frames. Most leaking roofs are due to cracks in the roof tiles that are the result of accidental damage. A ball on the roof for example and an over-excited teenager climbing the roof to fetch it can cause a broken or cracked roof tile.
The simple installation of a television antenna can do the same thing.
Your roof should be inspected regularly for cracked tiles or areas that require re-pointing. This really is a job for a qualified tradesman. A regular building inspection will cover this for you and give you the peace of mind you need.