HD Video through home network. What is possible

[#1]

I'd like to send the signals from my sky+ box through the home network so that I can receive programs on monitors around the house and I'm wondering if the technology exists for this
HDMI over RJ45 via router
Would I need some kind of adapters or special router for this?
Can anyone advise?
Thanks

[#2]

try this catalogue,  lots of types and prices http://www.keene.co.uk/multi.php?mycode=PB5000

[#3]

try this link it is a Keene brochure pdf about HDMI
http://www.mailingm.co.uk/1/link.php?M=3356666&N=5384&L=6266&F=H