So I have an old house (circa 1790) that I'm trying to install data cable into. It has 2 floors for living, and attic and a basement. The issue that I'm running into is that there are only a few places that reach from the basement (where the modem and switch are housed) to the attic and they all already have either plumbing or electrical wires running through them, and the walls are all plaster, which I don't want to mess with to make new routes. There's on spot in particular that would be ideal for getting a wire through (I managed to get fish tape from the attic to the basement with relative ease), but there is an electrical run already there. However, there is also a derelict coax cable already installed there as well, which was able to transmit HDTV with no problems when it was still in use. I'm wondering if that is a good enough sign that shielded Cat6 would perform ok there, or whether I should look into either fiber or finding another path down. The run would be about 70-80 ft total with 30 ft or so alongside the electrical. Thanks for your input!
Side note about the electric runs: the wires that are not in a conduit are only to connect the attic lights, which are seldom on, and then there is a shielded conduit which houses the power for the HVAC system up there.