I currently have a white sky box ie no HD The wire is a little too short, that's the two white cable joined together with a thin wire at the end which is screwed into to sky box. 1. Can I extend this with some sort of DIY kit? I'm due a replacement new black box. Not signing up to Sky HD but the person said there are several free/ standard channels with HD. 2. Would this require new cabling to what I currently have, so when I get this installed I can get the length to be extended at the sametime?