I did an FM signal report for your location. You have some very strong local FM signals that might interfere with TV reception. Ordinarily, they would only interfere with VHF signals, but since they are even stronger than your strongest TV signals they might interfere wit the reception of KCKS.
http://www.fmfool.com/modeling/tmp/6...6/Radar-FM.png
http://www.solidsignal.com/pview.asp?p=zhlsj
http://www.nsccom.com/hlsj.aspx
If the antenna is outside, the coax shield should be grounded with a grounding block that is connected to the house electrical system ground with 10 gauge copper wire for electrical safety and to reject interference. For further compliance with the electrical code (NEC), the mast should also be grounded in a similar manner to drain any buildup of static charge, but the system will not survive a direct strike.
Grounding the coax with a grounding block makes the FM filter more effective.