Video sender problem

[Kathyan]

I have sky+ downstairs and a video sender to relay up to my bedroom. For the past few months I have been getting interference on the tv upstairs, but only when it's on the AV channel. This means that when I try to watch Sky upstairs it's annoying to have lines going across the screen. I have tried replacing the video sender, the adaptors the extension that thy are plugged into and now even the tv! It hasn't solved the problem. Does anyone know what could be wrong please? When the tv is on terrestrial it works fine.

[Everhelpful]

Kathyan,I have bought 4 different Video Senders,2 very expensive as well,and none of them work very well.Think they are a bit of a rip-off actually.

[Kathyan]

When I first bought it though, it worked perfectly. I can't understand what's wrong, unless there's something in the sky+box that stops them working so that you have to have the multiroom subscription!