Roof antenna for southern coastal Mississippi

[chambala]

I am going to be installing a roof top antenna. I plan on installing the antenna on the Dishtv antenna bracket. I am located in Biloxi, MS which has one ABC and one FOX network station. The closest area to me for NBC and CBS is Mobile, Alabama.I have no idea which antenna to purchase that will allow me to recieve all four major networks.
Can someone assist me in this matter?
Thank you.

[tigerbangs]

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