If you get the COMPONENT Video dongle for your C41, then you could feed HiDef video to the second TV. But it would require FIVE coax cables .... 3 for the Component Video (red, blue and green) and two for stereo audio.
Bottom line .... there is NO cheap way to send HiDef video to remote TV. The lowest cost solution, if you don't want SD video, is to get a Receiver for that second HDTV.