Without being there looking at the spectrum analyser, it's almost impossible to tell as the signal measurements you have mean very little as they have no benchmark. eg: what is 90% signal strength equal in dBuV? The same with signal quality... what is 100% in BER and MER?
There can be numerous causes of why one frequency is affected more than others.
Firstly, which suburb are you in?
What antenna are you using and where and how is it mounted?
How many outlets are in the house (incl any not being used)?
Are there any signal amplifiers or powered splitters used?
Is the coax well-shielded.. eg: RG6 Quadshield?
Are the TV's all different brands?.... any LG or Samsung?
Here's an odd one.... do you have a computer case with an Antec brand fan or power supply?
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