HD Channels Help

[Havoc]

I have a HD Receiver/DVR in my basement and I am feeding 3 TVs in my bedrooms through coax (Centralized media panel) from the basement. I am using IR extender to control the HD receiver/dvr. I recently bought a 1080P LCD tv which can take the HDMI input. I noticed a huge difference in the quality when I use HDMI cable vs Coax cable. Is there any way I can get the same or improved quality HD channels without using HDMI. If I have to use HDMI then I won't be able to put the HD Receiver in my basement. I really don't want to rent another HD Receiver. One option could be to run a HDMI cable from basement to the LCD Tv but I would like know of any other options available. Please Help.