Stacking two antennas will rarely establish reception of a channel that won't come in with one of the same. Your problem could be resolved (provided you have addressed the mounting and aiming issues mentioned by Electron) by adding an amplifier. The problem is that the strong channels in your report will over load the amp.
Here is an "outside the box" one antenna solution that should work:
Use a Blonder Tongue CMA-BB. This is a UHF/VHF antenna with seperate un-amplified output.
You could run another coax from that and a A/B switch to go from amplified to un-amplified.
Let me know if you want to try this fix and I will find a supplier of that product.
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