I got my answer:
WTXF_Technical
Aug 16 at 9:43 AM
Fox29 has suffered a catastrophic failure in our new transmission equipment. We have a temporary agreement with another local station (6ABC, WPVI) to carry our main channel until we can effectively repair our own facility. Please rescan your TV to find us. We will return to air on our regular frequency with Movies!. Buzzr, and Light TV as soon as possible. You will need to rescan your TV again at that time.
Thank you for your patience and understanding while we soldier through this disaster.