I’m going to throw out two suggestions that I have tested and used in video production: HDMI to CAT6 converter (have tested it to 50 feet of CAT6 cable between boxes) and wireless HDMI units from Gefen. Both offer continuity of the uncompressed signal (out of my Canon HV20’s HDMI port). Capture using the BM Intensity card and converted to a DI file using the Cineform Prospect HD software – all in realtime.
Note that Gefen makes two wireless HDMI models with different technologies. You want the one that offers uncompressed transmission.
Note also that there are many many HDMI to CAT6 converters. There are cheap boxes from Hong Kong, which is what I have and work great to 50 feet (not including the length of the HDMI cables at each end). There are also more expensive units that claim to be good up to hundreds of feet (such as the TVone products).
Cheers