I have a BeoVision 5 which I'm told is losely based on the Avant chassis and it works for me. It is likely the STB controller is similar. 1) That item looks like it will work. But it is not necessary if you are happy to either hack your ATV or install bought software! I use mine plugged in directly...

Guys I have had exactly the same issue and the way to resolve is to use the following, it take HDMI and spits out Composite which the TV will then modulate and also RCA L and R Audio http://www.digi-box.co.uk/Products.aspx?productid=1157 The only issue is that it costs as much as an AppleTV, and also...