Need Antenna Help!!!

[jcutler]

I live in Virginia Beach, VA 23454 and I have a Radio Shack HD Antenna on my roof. I am not sure of the model, but it is one of the bigger ones. I have had it up there for a couple years and the last time I used it was last summer and I could get multiple channels like ABC, CBS, FOX and the major channels and a few others. I just tried to watch tv using the antenna today and I could only get channels 3 and 13 which are CBS and ABC. I can not get FOX or NBC which are the ones I watch. I rescanned with no luck and I turned the dish up a little and nothing new and to the side a little and nothing changed. I rescanned everytime I moved it and I still only get two channels. There is nothing that seems to be in the way at all. What could causing this and what should I try next? Thank you for your input.

[ProjectSHO89]

Inspect the antenna for corrosion. Clean as needed.

Replace the matching transformer and coax as incremental steps.