Background: I live in a level two apartment and want to get WiFi in my individual lockup basement garage and install a security camera. I have pulled a Cat6 UTP cable to the garage via the services shaft being careful to avoid some of the mains cables. At a few sections in the shaft they cross over one another and are very close together. For the majority of the run (100 feet in total) in the shaft they are about 12 inches apart with other building network cables except for the situations already mentioned where they are close to one another. Problem: I cant seem to get any network connection in the garage to the router in my apartment using the new Cat 6 cable and I suspect interference from the AC mains cables. I have tested each of the four pairs to ensure integrity of the cable by terminating each pair end and got a complete circuit to ensure I did not accidentally break / cut the cable during pull through. Question: Assuming that the interference is from the Mains cables (or other devices in the ceiling void I can't see) is it likely that the interference would be reduced or eliminated if I were to replace the Cat6 UTP with Cat6 Shielded cable ?