Trying to set up my freeview in my new house in E17, London. There is an existing aerial on roof with a coaxial cable coming down into living room. However, the tv is either just showing what programme is currently on each channel, with no audio or visual, or sometimes just saying 'no signal'. I am not sure how old the aerial is, or indeed if it has been working recently. I have also not got a ladder long enough to check the connection to the coaxial cable. I have had a look at the FAQs but I am not sure where to start to fix this?