Disconnect ALL parts of the radio shack preamplifier , the preamp , the power injector , the power supply.
Return the radio shack preamplifier for a refund or put it in the trash.
_______________________
The 2 antennas Will Not be connected on to one coax.
Aim the C490 at Nashville.
Aim the RCA ANT3038XR at Hunsville.
Run Separate coaxes from each antenna to the location of the Tv and connect the Separate antennas and Separate coaxes to a Remote control A/B antenna switch ,
http://www.mcmelectronics.com #32-4425.
Digital Tv tuners can develop - Digital Glitches - that are not cleared out with a simple channel scan. Do this
http://www.dtv.gov.com/rescan.html.
Most Digital Tv's can rescan and add channels without losing the first channel scan.
And some Digital Tv's can add channels manual one at a time.
The -->REAL Channel<-- that is being transmitted and received is what is Added one at a time.
The tvfool channel list , lists the REAL Channel and the Virtual Number.
_________________________________________
As always , trees and tree leaves do a real good job of reducing or blocking Digital Tv reception and so do buildings and other obstructions including your own roof and house.
It is best to install the antennas at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception including your own roof and house.