NR4P said:
You can't do HD with 20 Mbps between points.
DECA requires well over 200 Mbps to pass internal tests. So that's an advantage to wired either through Cat5 or DECA.
I deleted a reply of mine earlier that was going to say something like this, because it isn't quite true.
1) 200 Mb/s isn't the internal test of the DECA networking. What you're mixing up is the Phy Mesh rates.
2) One HD stream, even with OTA MPEG-2, doesn't exceed 20 Mb/s, without using trickplay.
3) MPEG-4 streaming may not exceed 14 Mb/s.
Now to address the 20 Mb/s connection: if may work, but if any packets/bits get dropped, there isn't a lot of "room" for recovery, so streaming may not be as good as it should.