Most likely you are out of luck. I doubt that you will get CBS at all, and NBC only when the weather is "right". (Tropospheric effect.)
If you click on the channel in your report you will see the terrain profile showing what is between the tower and your house. On CBS you are in a deep RF shadow and NBC is not much better.
At 90 miles, a NM of only 3.1 for both, 30k power, (at your house), for CBS and 300k for NBC you will have to go to extreme measures to receive them reliably, if at all.
Whatever you buy, make sure of what the return policy is, you'll need it.
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