Thank you for the new report. Your TV and FM signals are still very strong.
FM
http://www.fmfool.com/modeling/tmp/3...3/Radar-FM.png
In addition to following the advice by ADTech, I suggest you try inserting an attenuator in the coax line between the antenna and the tuner to see if overload is a problem. Also try inserting an FM filter to attenuate your local FM signals.
A splitter can be used as an attenuator; 3 dB for a 2-way splitter, 7 dB for a 4-way splitter. There is also a variable attenuator available:
https://www.antennasdirect.com/store...ttenuator.html
The ATT-1 knob has 3-3/4 turns, so I put a mark on the knob with an ultra fine point Sharpie to count the turns. Clockwise rotation increases the signal; minimum attenuation at full clockwise rotation. When I use mine to make tuner sensitivity tests, I start there, and rotate the knob counterclockwise to increase the attenuation for the test.
http://www.avsforum.com/forum/186-co...l#post48473881
You can try this FM filter
https://www.antennasdirect.com/store...on_filter.html
or use a HLSJ as an FM filter, which blocks everything below CH7, including the FM band.
http://www.solidsignal.com/pview.asp?p=zhlsj
WITRELESS ENGINEER has a good point about possible cell tower interference.