The other issue I have seen is to keep the coaxial cable away from all other electrical cords. I have also seen if there is access coaxial cord, and it is spooled up in a circle and near any electrical cords, it makes it even worse. If there is access cord, keep it in the middle, of the run, away from all other electrical cords. Look at the schematics of the building, see if there are any conduits running under the floor with electrical lines in them. That will cause issues too.