OK, I posted a week ago about my AV transmitter playing up - turns out they were faulty. I borrowed a pair of these from a friend (http://www.dse.co.nz/cgi-bin/dse.storefront/463a678d010bf5a2273fc0a87f3306d5/Product/View/L5963) and they work ok: The picture is crystal clear but I'm getting a single line of interference from my router and it gets bigger when my download rate goes up. The problem is solved by turning off my Wireless router - which fails the entire purpose of having a TV in my home office connected with an AV transmitter to SKY. I've tried to change channels on the router (CH 1 to 11) and on the AV transmitters (CH 1 to 3) but it didn't solve it.

Question: If I opt for a 5.8ghz system, will it interfere with my 5.8 phones?

I have a combination of DECT and 5.8 phones at the moment.