It appears that WPTZ shares channel 14 with CIII. WPTZ will remain on channel 14 during the repack. In order to eliminate the interference would would need to create a null toward CIII. One way to do this would be to stack a pair of identical antennas such as the 43XG horizontally spaced precisely 26” apart. Feed them with identical lengths of coax to a two way splitter.
http://www.hdtvprimer.com/antennas/ganging.html