Wow! Bobs answers is concise, and accurate.

10 Meters is currently the longest consistent working distance for ARC/eARC (the issue is the copper wires in the AOC), HDBaseT extenders (some models) do rectify this by using active EQ, and ARC/eARC Only extenders are available (becoming more popular).

My only caveat with Bob's answer is that we (Ethereal Tech team) are worried about non powered cables causing equipment damage, it is important to remember that current (amperage) is drawn not pushed and if the cable draws more than the display can provide there is a (small) possibility of damage, we cannot say that it will, but by the same token we cannot say that it won't.

So, take no chances..