I know a guy in Frisco that gets all the Dallas channels plus KXII from Oklahoma with attic mounted antennas, so it can be done. I'm in Farmers Branch, use an old Radio Shack antenna my neighbor was throwing away, mounted it in the attic of the garage, I get over 80 channels most in the 90-100 signal strength range. Do you have aluminum foil lined roof decking? That can be a problem.
A link to the channels being received in Frisco, updated every 5 min.
http://www.rabbitears.info/tvdx/one_...01A67C8/tuner0