Recently had a new aerial fitted - wideband high gain with masthead amp and distribution box to send a signal into 4 rooms using twin screened cable. The aerial is now aimed at the main Winter Hill transmitter rather than the local relay and the signal is obviously superior. The other advantage is that I can now get a Freeview signal. However, whilst watching TV the analogue picture goes fuzzy momentarily or the digital picture and sound freezes for a second or two. Reading around I gather this is called impulse interference but it's not clear how to get rid of it other than using screened cable. Is there anything else I can do? Will the situation improve once analogue is switched off and the digital transmitters are powered up? Thanks for any help.