I don't know any practical way Cox could scramble OTA signals. Have you checked the tower directions recently? In my area (Omaha) several of the stations quit using the towers northeast of here and switched to towers almost due south. With a Yagi design you can't pick those up without rotating the antenna. I actually swapped to a less directional antenna. (I've worked with rotors before, especially for long range FM. It's convenient with a single device but not so handy with multiple devices. These days the Yagi provides a dedicated feed to one room, and the dipole feeds the old amplifier which feeds the coax running around the house.
