I agree with ADTech.
LTE interference is not likely, but electrical interference to VHF-Low channel 3 is very possible.
Try searching for electrical interference noise with a battery operated portable radio for the AM broadcast band. An FM portable radio is not as good for this test.
Electrical interference on the AM broadcast band is often strong enough to also affect VHF TV signals. The interference raises the noise floor, which will reduce the SNR of the channel 3 signal.
Tune to an unused frequency first at the low 540 kHz end and then the high 1600 end. The antenna in the radio is directional, which can help you locate the source of the possible interference.
Is the problem constant, or related to certain times of the day?
Possible sources of electrical interference are CFL and LED lamps, motors, battery chargers, switchmode AC to DC power adapters, inverters, street lamps, and power lines.
Quote:
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A cell tower is located approximately .7 mile from the house......The antenna has been moved both horizontally and vertically as well as rotated.
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What is the azimuth for the cell tower, what is the azimuth for channel 3, and how far away is the channel 3 transmitting tower?