That would be bare minimum for HD and you could still lose packets under high traffic conditions: sports programs , etc. Higher B/W would assure no problems with HD streaming.
When I stream from my HDPro using the desktop client, vs 2.0 is see the speed indicator between 1.03 and 1.8Mbps on regualr movie type programming (non-sports).
That is with the highest video resolution settings of 1920x540, Full Rate video frames, Smoothness bar mioved to the Far Right. Audio seting at 32Kbps.
Hope this helps.