I have a PC with onboard video which also currently has a second video card (VGA+DVI+S-Video). I'm needing to connect it to a second display (32" LCD) over roughly 75' of coax cable. So far I've tried a using an S-Video to RCA and RCA to Coax adapter on the PC side as well as using an RF modulator to no avail. Any good ideas would be greatly appreciated.

PS - Options must be either PCI or USB (No AGP or PCI-Express slots).

TIA