I recently upgraded to a Freeview HD box and found that my reasonably new aerial will not pick up any of the HD channels.

Has anyone else been able to do so? The coverage checker says that the whole area is covered from the Crystal Palace mast.

I'd like to get an aerial installer to come and look at it, but all of them that I have spoken to suggest a brand new aerial, where as others have advised I just need a 'masthead amplifier'. I don't want to get up on the roof myself, but I don't want to shell out £180 on an aerial that is not needed.